Many investors wrongly equate high conviction with making a large initial investment. A more evolved approach is to start with smaller at-cost positions, allowing a company's performance to earn its eventual large weighting in the portfolio. This mitigates risk and improves decision-making.

Instead of reacting to stock prices, track the combined "owner's earnings" growth of your portfolio companies. This creates a private-equity mindset, focusing on underlying business performance. Over decades, this metric shows strong correlation with portfolio returns and helps maintain long-term discipline.

Smaller initial positions can generate better returns because investors are less emotionally attached. This distance allows the investment thesis the time it needs to mature without being derailed by over-analysis of every minor news event or price fluctuation.

Since it's impossible to know upfront which investments will generate outlier returns, the key isn't picking them but holding them. The biggest mistake is 'cutting your flowers to water your weeds'—selling winners to invest in underperformers. You must 'circle the wagons' around your core assets.

Contrary to the 'hold forever' value investing trope, a three-year period of underperformance is a strong signal that your initial thesis was flawed. It's better to admit the mistake and reallocate capital than to stubbornly wait for the market to agree with you.

The goal of diversification is to hold assets that behave differently. By design, some part of your portfolio will likely be underperforming at all times. Accepting this discomfort is a key feature of a well-constructed portfolio, not a bug to be fixed.

Objectively track whether new information strengthens or weakens your belief in each holding on a monthly basis. This simple journaling practice forces a regular review, helping you decide whether to add capital or trim a position based on fundamentals, not share price movement.

The sign of a working diversification strategy is having something in your portfolio that you're unhappy with. Chasing winners by selling the laggard is a common mistake that leads to buying high and selling low. The discomfort of holding an underperformer is proof the strategy is functioning as intended, not that it's failing.

To combat endowment effect and status quo bias, legendary trader Paul Tudor Jones advises viewing every position as if you were deciding to put it on today. This creates a zero-based mindset, forcing you to justify each holding's continued place in your portfolio.