Markets are fundamentally volatile. No way around it. Your problem is not in the math. There is no math to get you out of having to experience uncertainty.

Good traders trade. Good letter writers write letters.

Losing a position is aggravating, whereas losing your nerve is devastating.

Trying to trade during a losing streak is emotionally devastating. Trying to play 'catch up' is lethal.

Be sensitive to subtle differences between 'intuition' and 'into wishing'.

There are old traders and there are bold traders, but there are very few old, bold traders.

Longevity is the key to success.