If you can, ride with someone that corners well and follow their exact moves. I was never very good at fast, curvy downhills, much tho' I loved them. A friend of mine was awesome at descents! So I took to following her downhill whenever I rode with her and it definitely helped my confidence and abilities. That and practice, practice, practice, especially when you start feeling that you're "getting it." Keep doing it, till it comes more naturally.

Annie