Absolutely. That coupled with early entries will mess your head up. I had this nasty little habit of saying to myself, Ill get in a bit early and just risk a few ticks. When that got stopped out I would do it again and pretty soon I was in a battle just to get even.
Heard, not remember where, that you must NOT see trades as an multiple answer quiz, where you always have some chance by guessing. Rather you must see trades as an quiz where you get -2 points by every wrong answer.