Make a promise to yourself to wait 24 hours. Make the promise again the next time.

My form of self harm used to be cutting, in order to stop I used rubber bands, but then my friends yelled at me for that and so I started drenching a sponge, or cloth, in water and freezing it. When the need arises I twist the frozen sponge. It hurts a bit but doesn't break skin. (Idea from counselor)