Grounding is covered in many really good pagan books. Some books that I have found helpful are those by Diane Steine (she has a lot of them, so they should be easy to find, even used) and Diane Mariechild's Motherwit or The Inner Dance. Both of these ladies deal a lot with psychic and emotional healing and grounding and should have some good information.

Basically grounding is an exercise that connects you with the powers of the earth and drains off exess energy or negativity/nervousness etc. A very simple way is to just close your eyes and imagine your body growing roots that go down into the ground like a trees. Let those roots draw off any nervousness or negative emotions and then draw up the solid power of the earth mother. Basically you become a tree rooted to the earth, drawing nutrients from her and letting any waste be disposed of through the roots. Does that make sense? I find this to be a very relaxing and energizing exercise and a good way to center yourself.

I am sure there will be other great suggestions that might be more dance oriented from some of the other members here, but that is a start at least.

Dian