I don't know about humility helps or not but one needs to be 100% honest to himself and towards his instincts.Trusting your instincts and your research and accepting the result is very important.Because if the result is in your favor it builds your confidence and if not than it builds your experience.Patience is also an important key in trading.This doesn't mean you don't have to do any research or study anything.All those are primary steps which everyone has to follow on that basis instincts are developed and decision are made.