Don't think about it, just go for it and give it some beans! On the other hand you could find little drops and practice your tecnuiqe and everytime just go a little higher e.g 2ft, 3ft,4ft, and so on. That is the way i learnt but now i am more confident with myself and just go for it Also you could stand on top of the drop looking down at the ground and picture yourself in your head doing the drop and then do the drop that works well usually.