I agree, certainly. The best way to stop is by not starting. I thought I wouldn't end up spiraling into the deep pit of SI the first time I broke my skin, and yet last night I prowled around the house looking for anything to hurt myself with because I just couldn't control my own mind or body. Please don't start.
I would recommend the butterfly project. When you feel like hurting yourself, draw a butterfly on your arm or wherever you want to cut. Name it something special to you and know that if you SI before the butterfly is washed away, the butterfly will die.
If this doesn't help, I'm sorry, but whatever you do, don't cut yourself because it will make you worse off in the long run. Please update us as to what happens and if you need help, I think we're all here for support.