Back when I went to the Frank Hawley Drag Racing School, they pounded into our heads time and time again, to NEVER contemplate what can/could go wrong. You only visualize and think about EVERYTHING going right! Their reasoning was that if you are thinking "don't hit the wall, don't hit the wall" chances are you are going to hit the wall. It was a self fulfilling prophesy. Basically, thinking negative, causes negative things to happen. Obviously you can not account for mechanical failure, but you can certainly take control of the human aspect of things.