I remember when I first got into trading, wheww, I could write a book of mistakes. All in all I think the two biggest mistakes that really made me evolve would be to stop listing to everyones "professional" opinions. That would make me second guess myself and loose out, and constantly leave me in confusing stressfull situations from all the contradicting statements. And the other was simply learning patients. To stop trying to get rich in one week, and slow down and use my brain and take emotions out of it.