It is actually quite common when we stop one form of self-harm to replace it for another. The only way to work towards stopping self-harm is to address the issues that are causing you to self-harm in the first place and to develop healthier coping mechanisms.
You are only fooling yourself though if you believe that you could have full control over your cutting. I know myself I have said I will only cut once and that will be it but it doesn't work that way. Self-harm is an addiction and it isn't that easy to just stop at one cut. I would recommend you have a read of the
cutting warning label.