Please try to abstain from injuring yourself. Try to keep as busy as humanly possible. Most of all keep your hands busy! I don't care if you have to masturbate all night or pick up a pen and draw continuous circles all night...do it! As long as you keep your hands busy I think you'll do just fine!
Do you have a live journal? That may help, too. I have one and I journal in it when I'm struggling with cutting. Just go to
www.livejournal.com to set one up. It's also free!