Its 50/50 as Do alot of ground work with poles and Cavaletties at a trot then start cantering them and then gradually go to jump posts and do alot of cross rails to build up ur confidence
Do a lot of flat work and just piles on the ground. No jumping. Then after you're very confident with that try adding standards to the side of the poles. It'll then sort of look and resemble a jump without actually being one. Use some cavalettis and work your way up slowly. Good luck!!
Yes and no. Sometimes it's very mental so you have to be a positive thinker to gain confidence