Three Gates of DIY Stock Picking
Only pick stocks if you pass interest, education, and time.
Coffin refuses to give a blanket recommendation between picking stocks and indexing. Instead he proposes three gates: interest, education, and time. If you fail any one, individual stock-picking is unlikely to pay off — index funds, robo-advisors, or a professional advisor are better fits.
The framework reframes the active-vs-passive debate from 'which is better' to 'which suits the investor in front of me'. It also captures Coffin's view that even index investing involves active choices, so honest self-assessment matters whatever route you take.
Its value is in protecting beginners from over-allocating to a strategy that demands skills and time they don't actually have, while keeping a viable on-ramp for people who do.
- Interest, education, and time are non-negotiable prerequisites for stock-picking.
- Indexing is not truly passive — you are still making active country, weighting, and timing decisions.
- Beating the market is possible but rare; the realistic delta is marginal, not 10%.
- Use small position sizes to learn before risking significant capital.
- If any gate fails, the right answer is delegation (index, robo, or advisor).
- Test the interest gateAsk honestly whether you actually enjoy reading filings, learning about businesses, and following companies. If the process bores you, you won't sustain it.Pro tipTry reading one 10-K cover-to-cover before committing capital.WarningExcitement about getting rich is not the same as interest in research.
- Test the education gateMake sure you can read accounting statements, interpret filings, and understand the difference between net income and cash flow. A finance degree isn't required, but the literacy is.Pro tipPick a company you use and rebuild a simple income-statement-to-cash-flow walk before you buy.
- Test the time gateEstimate the hours per week you can actually give to research and ongoing monitoring. Three days to a week of work for an initial dive, plus continuous maintenance, is the realistic baseline.WarningDon't model your future free time on your most productive week.
- Pick the route that matches your gatesPass all three: build a stock portfolio. Fail any: choose indexing, a robo-advisor, or a full-service advisor depending on account size and complexity.Pro tipAccount size, taxes, and estate complexity push you toward an advisor even if you pass the gates.
- Run a small live experimentIf you pass the gates, allocate only a small portion of capital to individual stocks at first while keeping the bulk professionally managed or indexed. Build skill on safe-to-fail money.Pro tipTrack decisions and outcomes — most beginners overestimate their skill until they review results.
- Re-evaluate annuallyEach year, audit your gates and your results. Move money out to professionals if life eats your time, or scale up if your interest, education, and process actually held.
He started with ETFs, then moved to individual stocks once his job exposed him to deep fundamental research. The gates passed in sequence: interest first, then education on the job, then time built into his career.
His firm has declined clients whose accounts were too small, telling them ETFs would serve them better than a bespoke portfolio. The gates apply to advisors choosing clients, not just clients choosing advisors.
Coffin works as an investment analyst and portfolio manager and answers this question constantly on his channel. Rather than declare one method best, he distilled the question into three gates after observing that most retail investors fail one of them — usually the education one, especially around accounting basics like the difference between net income and cash flow.