The Two-Tool Rule: If a Side Hustle Needs More, Think Twice

I nearly talked myself out of a good side hustle once. It had nothing to do with the idea.

Someone suggested I sell digital planners. Simple, they said. Make it once, sell it forever. So I sat down to have a go.

Two hours later I had a half-built Canva account, a Pinterest board with three pins on it, a browser tab open on “best Etsy keywords,” and a nagging feeling I’d signed up to learn six new tools before I’d earned a single pound.

None of it was hard, exactly. That was the trap. It was six perfectly reasonable little tools, and together they’d turned a simple idea into a part-time computer course.

That day I started using a little test I now run over every idea, and it’s saved me a lot of wasted afternoons since. It’s how I tell a simple side hustle from one that only looks simple. I call it the Two-Tool Rule.

The work you see isn’t the whole job

Here’s the easy mistake to make when you’re weighing up a side hustle. You judge it by the part you can see.

Someone says sell printables on Etsy, and the visible work looks like making a printable. Someone says start a newsletter, and it looks like writing one email a week. Someone says sell a small course, and it looks like recording a few videos.

But the visible work is almost never the whole business.

Behind it sits the boring stuff. The accounts, the logins, the subscriptions, the settings, the tools that all have to talk to each other. That hidden pile of tech can turn a lovely simple idea into something that eats your week.

And look, I’m not saying you couldn’t learn it all. You could. That’s not the question. The question is whether you should have to, just to earn a bit extra.

The Two-Tool Rule

Before you commit to any side hustle, ask yourself one thing:

Could I realistically find customers, deliver what I’m selling, and get paid, using no more than two main tools?

Not forever. Not at some huge scale. Just to make the first sale.

If the answer is yes, you’ve probably found something you can test this week. If the answer is no, have a good look at what you’re really signing up for.

Count the business, not the activity

Let me show you what I mean with two ideas that sound about equally simple.

Say your name’s Susan, you’re 62, and you spent years in office admin. You’re organised, good with words, fine with email. You’d like a few hundred pounds a month without turning retirement into a second job.

Idea one: sell digital planners online. Idea two: offer proofreading and tidying-up for local small businesses.

The planner sounds simpler, doesn’t it? Make it once, sell copies while you sleep. The proofreading sounds like proper work, because you deal with each customer yourself.

Now run the Two-Tool Rule over both.

For proofreading, Susan could start with just two things:

1. Email
2. Word or Google Docs

She finds her first few customers through people she knows, a local Facebook group, or a handful of friendly emails. Someone sends a document. She fixes it. She sends it back. She gets paid by a simple payment link or a bank transfer. The tech almost disappears.

Now the planner. To sell it, Susan might need Canva to make it, Etsy to list it, and some understanding of listing photos, file types and descriptions. She might want keyword software to work out what people search for. Pinterest images to pull in visitors. Cloud storage. Later, email software to build a list.

Not one of those is scary on its own. That’s exactly why the trouble sneaks up on you.

Complexity rarely shows up as one big problem. It shows up as six small, sensible tools. And every tool asks something of you. Another login. Another screen to learn. Another thing that breaks. Another thing you have to remember how to use three weeks later.

So here’s a line worth keeping: don’t confuse a simple product with a simple business. A downloadable PDF is a simple product. Selling it at a profit might not be a simple business at all.

The three jobs behind every simple side hustle

Under almost any side hustle, three jobs are hiding. You need to:

• Find the customer.
• Deliver the thing.
• Get paid.

When you’re looking at an idea, ignore the exciting sales pitch for a minute and write down exactly how those three jobs will happen.

Say you fancy offering CV reviews for people going back to work. How do they find you? Maybe Facebook or LinkedIn. How do you deliver it? They email their CV, you send back your notes in a Word document. How do you get paid? A payment link or a bank transfer. That business could run on almost no tech at all.

Now say you decide to build a paid membership that teaches people to improve their own CVs instead. Suddenly the three jobs balloon. Somewhere to attract people. Somewhere to collect email addresses. Somewhere to take payment. Somewhere to host the lessons. Maybe somewhere for members to chat. Maybe email software on top.

A membership isn’t a bad idea. It’s just a completely different kind of side hustle from the sentence “I’ll teach people to improve their CVs.” Same subject. A very different amount of fuss.

So pick the simplest way to deliver the result you want to sell. Most people do it the other way round. They fall for a business model first (an Etsy shop, a course, a funnel), then squeeze their knowledge into it. If you want a low-tech life, that’s backwards. Start with what you can help someone with. Then find the least fiddly way to hand it over.

A retired teacher helping GCSE students doesn’t need a website and a booking system to start. Facebook and Zoom will do. A retired bookkeeper might need little more than email and a spreadsheet. The first goal isn’t to build the finished business. It’s to prove one simple thing: I can find someone with this problem, help them, and get paid.

The hidden cost isn’t just money

You’ll always spot the subscription prices. £15 here, £20 there.

But the bigger cost of a big pile of tools is your attention. Every extra system is a small tax on your head. You have to remember what it does, notice when it changes, and fix it when it stops behaving. That tax is dear in a side hustle, because the whole point was that you didn’t want another demanding job.

Say your side hustle brings in £400 a month. If it runs on two familiar tools and a few enjoyable hours, £400 feels well worth it. If it needs you to babysit seven platforms and watch a tutorial every time a screen changes, the same £400 can feel like a chore.

So don’t just ask what you might earn. Ask how much fuss it takes to run:

• How many systems must I touch regularly for this to work?
• How many of them do I already understand?
• What happens if I ignore one for a fortnight? Does the whole thing stop?
• Could I explain the whole process, from finding a customer to getting paid, on one sheet of paper?

Those questions tell you far more than asking whether something is “easy.” Easy is vague. Fuss you can actually count.

Add tools when a real problem shows up

The Two-Tool Rule isn’t a ban on ever having a third tool. It’s a filter to catch pointless complexity early.

One day you might add a website, because you’re getting enough enquiries to justify one. You might add email software, because you’ve got hundreds of interested people to write to. That’s sensible. A real problem turned up first, and the tool solves it.

The trap is building things to solve problems you don’t have yet. No customers, but a fancy booking system. No sales, but a clever email funnel. No audience, but three social media schedulers.

I’ve done this. It feels productive. It’s actually just a very tidy way of avoiding the one scary question: will anyone actually pay?

That’s the quiet gift of starting simple. With only a tool or two, the idea has nowhere to hide. If you offer proofreading by email and nobody bites, you learn fast that the problem is the offer or the audience. If you’d built a website, a funnel, a lead magnet and a mailing list first and still made no sales, you’d have half a dozen things to blame and no idea which one. Simple setups give you a clear answer. That’s worth more than it sounds.

Try this before you watch a single tutorial

Next time an idea tempts you, don’t start with “could I learn how to do this?” You probably could.

Instead, grab a sheet of paper and write three headings: Find customers. Deliver the work. Get paid. Under each one, write down the tools you genuinely need. Then count them.

One or two familiar tools to make the first sale? That’s worth a proper go. Five, six or seven before you’ve earned a pound? Don’t reach for the tutorials yet. Ask the better question: is all this tech helping me sell something valuable, or have I accidentally picked a side hustle where managing the tech is the side hustle?

For anyone who wants a genuinely low-tech way to earn a bit extra, that difference matters more than the idea itself.

I’d love to know which idea you’re weighing up. Just reply and tell me, and I’ll happily run the Two-Tool Rule over it with you.

Try this with AI

Want to pressure-test your own idea in five minutes? I do this all the time. Use whichever AI you already have (ChatGPT, Claude, Gemini, Copilot, or another). Swap the bit in brackets for your own idea, then paste the whole thing in.

Affiliate disclosure: some course and resource links may be affiliate links. If you buy through one of them, I may receive a commission at no extra cost to you. I am fortunate not to depend on affiliate income, which gives me the freedom to be selective and recommend only resources I believe are genuinely useful.