My best friend said something a long time ago when I was staring down at a big drop. Still use this whenver I need to.
"In the words of Jackie Chan - No think just go!"
The longer you sit and think, the less likely you will actually do it and the more likely you will second guess and bail. I have never hurt myself doing something I fully committed to, I have nearly crippled myself 30+ times bailing on shit because I second guessed myself.