Trampoline and powder. If you have the 5 or 7 down on snow and have an idea of the cork you can visualize it and dip into it. If you aren't confident you can try them on the trampoline. I remember not being able to visualize right side corks when I was younger. I just kept trying them on the tramp and got them down. Ended up having a way sicker spin then my left sides. I don't even know if I could cork that way anymore but just saying that the tramp helped me learn it.
"If you don't do it this year you will be one year older when you do"