[aztecx]

I think one personality trait you need to have is to not suffer from the Dunning-Kurger effect. You should not rate your skill higher than it really is because then you lack the capability to acknowledge your lack of skill and actually improve. I think a lot of players suffer from this, hence the customary 'you're such a noob' after you beat them in a game. I believe it is important to know there is room for improvement but I don't believe that beating yourself up really helps.

I think at higher levels of play having very high confidence is a requirement of being successful. I notice my game improves dramatically if I have the confidence to back it.