scared of air? once you stomp a few big jumps its not so scary.
And as wierd as it might sound, once you start spinning and stuff on big ass jumps, they don't seem as big than when you strait air them... no time to look down.
if you ski lots then you get better and after doing lots of small jumps you do bigger ones and so on. You don't have to kill yourself to improve, people can be good at freestyle straight away just because they're good skiiers, as far as i can tell