I had my lesson yesterday and I think my jumping position is really bad. I didn't manage to do a single jump right. My instructor said that I keep leaning on the horses neck, but I only do it because I can't balance without doing it. I kept doing the jump over and over again and was told that I was leaning on his neck every time, will I eventually learn how to not do it, or is there anything I can do when I'm not at my lesson? The other girl in my lesson is really good at jumping though, so the jump height got raised a bit which might have put me off a bit (but I know that they've got to keep the lesson interesting for her as well, it wouldn't be fair for me to be restricting her). Socks (the horse) refused a few times, or just stepped over it at the last minute which was because I wasn’t getting him to go fast enough, I think it was just my nerves because I knew I wasn't supposed to lean on his neck, but I wouldn't be able to balance without doing it.
Also, unrelated to the jumping, but Socks was being quite difficult because he always wanted to be with the other horse (Nelly). Sometimes he would do weird things like swinging round when I was trying to walk away from Nelly, which would get me told off because Nelly sometimes kicks out and doesn't like horses near her. He would also go really slow and need a big kick every few strides when I was on my own, but when he was behind Nelly he would want to be going really fast. Is there anything I can do to stop this behaviour?