80% in the head bro, trust me, backflips are the easiest things mankind invented, however, to get through it you must be confident.But their are few things to do to land on your skis.
Once ou arrive on top of the kicker, pop nicely (otherwise your head will hit the kicker) pull your head backwards as if you want to look the sky.
Dont close your eyes or you'll stop rotating. Don't block your rotation until you see the landing (now you're gonna tell me "but how do I know, it goes too fast", well, first, you will see the landing, and second, you can feel it, instinctly you'll stretch and land nicely)