heres how i would start:
1. Start working on your core...this means doing sit ups. Your stomach (aka your core) needs to be strong in order to keep your balance.
2. Practice the pirouette prep. Don't turn. So in other words, for your right side pirouette: arms into second with right leg out, weight on left leg. then, right leg goes behind you, both legs slightly bent, right arm out in front. POP up onto the ball of your foot, with your right leg bent, and your right leg should be around your left knee, toes pointed. Arms should now be in front of you, creating a somewhat circle, typical pirouette arm stance. Stand in this posistion for awhile, trying to keep your balance. Stay in this posistion for as long as possible while holding your core. This will help with balance.
3. Work on your single pirouettes, use control. After finishing one revolution, hold yourself up on the ball of your foot without coming down onto flat foot.
4. Once you feel your balance is solid, try getting the momentum up for a double. it should come a little from your arms and a little from the prep. Just remember that the posistion of your arms is very important. Hold your core tight, along with most of the muscles in your body. Shoulders should be pressed down, and body should be straight up.
---->When I say your body should be straight up, try to imagine a pole going vertically through your body, starting at your feet and going through the middle top of your head. If you're on a pole, your back cant bend and you cant lean.
hopefully that helped and made sense! Thats just how i got my double down. Lots of practice helps =] Just be persistant!
I was/am a dancer =]