You almost have to nurture a case of depersonalization disorder. If you know any successful traders, you probably know what I am talking about. They don't seem

You almost have to nurture a case of depersonalization disorder. If you know any successful traders, you probably know what I am talking about. They don't seem to experience or interpret things like everyone else. To be playfully ironic, I'll list what I think are the two biggest issues: 1) Completely demolish the instinct to extrapolate linearly. 2) Train yourself to have no attachment to your expectations. (Coincidentally, this is #2 on the referenced webpage's list.) This is certainly not exclusive to trading (e.g. scientists should operate this way) but I think it's harder to practice in trading. Money makes consequences very concrete. (Edit:) If a scientist conducts an experiment that fails to find anything significant, it's still "good science (TM)." If a trader fails to be profitable, he has failed at trading.