The other day it jumped just over a metre for the first time

it might not be alot but its a big accoplishment for my group and me, as it was the first for all of us. However does anyone have any tips on jumping a metre? When I jumped that height I came right out of the saddle, I just think it was the first time jumping that height so I was a bit out of it. I luckly didnt fall and was able to recover and get away safely lol. Any tips on postion etc? thanks