Remember to keep your heels down and head up... remember the release...open up your shoulders...don't rchyour back... these are just some oof the things I have talked about with my triner over the years hope it helps!
Feel your horse, learn his\her jump and let them punch you out of the saddle, along with giving a proper realese, keeping elbows in, knees off the saddle heels down, look up, stay relaxe and supple look at were your going (next jump) , don't get ahead of yourself, or left behind, all that fun stuff :)
Remember to be confident, if your not confident your horse will feel that and they wont be confident. And keep your chin up, and looking ahead. Also roll your shoulders back, and keep a nice bend in your elbows. And grip your leg on your horse's side, almost like giving them a hug :)