I'm really nervous about horse jumping!?

when you are on the horse don't be nervous as long as your seated right and doing the right thing on her you will be fine.When she first starts to jump lean your body forward and once you are about to hit the ground go back slowly and by the time you hit the ground you should be seated.Oh and make sure you know you are about to jump because one day I didn't see that a tree had fell and I was trotting my horse and she jumped and i wasn't ready but I made it :) (personal experience)