I suppose it goes with controlling emotions...
But finding my comfort zone was the last thing i feel i needed to master/or be mastered. I'm talking in terms of position size and risk.
When I first started with real money (spread betting) I quickly released that I could make money easily trading at £2pp, but when I stepped up to £10pp I lost money, and i lost it quickly.
The whole 2% rule never washed with me... And i don't know why its seen as almost gospel by traders. It dependeds how much 2% actually is of your total account (cash wize). and To YOU, personally.
Losing £20 on a trade was fine. No problem, onto the next one. BUT losing £100, be it only 2% of my account, was just to much for me. I became attached, emotional, loss chasing, gambling and all the rest (changing my strategy etc etc)
Back to £2pp and i was relaxed and able to make money again.
It took a while but I finally figured out that that 0.5% was as high as my risk tolerance can go.