For heelside carving, here are some tips:
1) Stay centered between both feet.
2) Stay aligned with your stance.
3) Adjust your bindings so you have a moderate amount of forward lean, so when you carve, your knees can still remain bent slightly.
Going down hills is what it’s all about, so if you are scared with that then you have a really big problem. First see a head shrink then hire an instructor. Then you should be fine 😉