DIY investing: what it really takes (and when it isn’t for you)

It is a Sunday evening. You have just read your latest statement, done the sums from the last two guides, and realised you pay thousands a year for a portfolio that looks a lot like a handful of index funds. A thought arrives that is both exciting and frightening: “Could I do this myself?”

Most people dismiss it straight away. It is too difficult, too risky, too much time. Some of that is true for some people. But much of it rests on a misunderstanding of what managing your own portfolio actually involves. This guide sets out what it really takes, what can go wrong, and how to tell honestly whether it is for you.

Wherever you are in the world. The building blocks are the same everywhere: a regulated platform or broker, the right tax wrappers for where you live, a process, and the discipline to follow it. I use UK examples first, with the US and others alongside.

Currency guide: £1 is about US$1.34 and about €1.19 (20 October 2026). A £500,000 portfolio is roughly $670,000 or €595,000.

“Managing your own money isn’t about being clever. It’s about having rules, and keeping them when it’s hardest to.”Alpesh B Patel OBE

Step 1: What “DIY” actually means

Do-it-yourself investing does not mean trading every day, watching screens or guessing which share will double. For most people it means:

• holding your investments on a regulated platform or with a broker, in the right accounts;
• deciding your mix of investments, and why;
• following written rules for what you buy, how much, and when you sell or rebalance;
• reviewing on a schedule, not on headlines.

Once a process is set up, the ongoing work can be modest: a regular review rather than constant activity. The hard part is not the time. It is the discipline.

Step 2: The right accounts for where you live

• UK. A self-invested personal pension (SIPP) for retirement saving, with tax relief on contributions up to the annual allowance (£60,000 for 2026/27 for most people). A stocks and shares ISA for tax-free growth, with an overall annual ISA allowance of £20,000; from 6 April 2027 the cash ISA limit for under-65s falls to £12,000 within that total.
• US. Your workplace 401(k), an IRA or Roth IRA, and a taxable brokerage account.
• Elsewhere. Most countries have their own tax-advantaged accounts, such as Australian super or a Canadian RRSP and TFSA. Expats should check carefully how their home and host countries tax each account.

Step 3: How your money is protected

A common fear is: “What if the platform goes bust?” Reputable platforms hold client investments separately from their own money. Compensation schemes also help if a firm fails:

• UK: the Financial Services Compensation Scheme can pay up to £85,000 per eligible person, per firm, for investment claims where a firm fails.
• US: SIPC protects customers of member brokers up to $500,000, including $250,000 for cash, if the broker fails.

Neither scheme protects you against investments simply falling in value. That risk is yours, with or without an adviser.

Step 4: The four skills that matter

1. A process. Clear rules for what goes in the portfolio, position sizes, when to sell, and when to rebalance. Written down.
2. Risk control. Knowing how much you could lose in a bad year, and being able to live with it.
3. Record-keeping. Tracking what you hold, what it cost, and how it has done against a fair benchmark, after costs.
4. Behaviour. Sticking to the rules when markets fall, the news is frightening, or a friend is boasting about a hot tip.

You don’t need a finance degree. You do need to be honest about the fourth skill. Research on individual investors has found that those who trade most tend to do worst after costs, largely because of overconfidence. A process exists to protect you from yourself.

When DIY isn’t for you

Be honest. Managing your own investments may not be right if:

• you know you would panic and sell everything in a crash;
• you don’t want to spend any time on it, even a regular review;
• your situation needs specialist advice: a final salary pension, complex tax, cross-border affairs, inheritance planning, a business sale;
• you are concerned about managing things in later life, and would like someone else to take over.

None of these means you can’t learn. They may mean a hybrid approach is better: buy advice for the specialist decisions and manage the investment part yourself, or keep some of your money managed while you build confidence.

Before you move a pension or portfolio

Moving from an adviser or managed service to managing it yourself is a big step. Check, in writing, what you could lose before you transfer anything.

What this taught me

The people I have seen do best managing their own money are rarely the cleverest. They are the ones who wrote their rules down, started carefully, and kept going when it was uncomfortable. The people who struggled usually had plenty of knowledge and no process.

What this taught me is that the real choice isn’t “expert or amateur”. It is “process or no process”. So the question to take away is: if markets fell 30% tomorrow, do you know what you would do?