I tried it once and never again because it neither alleviated any pain nor did it even hurt so I can’t say I’m speaking from experience

But I’d imagine methods that remove bad habits / form new better habits also work for sh

So here’s some examples of what could help when you get urges/thoughts:

Removing anything you use for sh from your house or at least make it inconvenient to access so the process of getting it might take long enough to make you change your mind

Doing other things with your hands and body if you’re able to like cleaning, aggressive journaling, fidgeting, exercise, etc, just expending physical energy

And potentially controversially I know natural psychoactives and psychedelics can help with habits and addiction, the latter of which literally mechanically rewires the brain but I’d highly advise against either if you’re not in a safe environment and or calm and healthy mental state

Id also suggest having alcohol wipes around if your sh involves opening wounds because at the very least you shouldn’t have to worry about it leading to infections

Just try not to feel guilty about doing that because that just makes it worse. It’s your body and yours to do whatever you want with, but I’d suggest expelling emotions through improving your body and environment rather than diminishing your body. At least with current technology you only get one for your whole conscious experience so try to at least be able to keep it safe and be comfortable in it despite how difficult or unideal that may be. As a person who’s disabled, and trans in ways more than just gender I absolutely despise my body it feels completely foreign to me and like someone else’s it just feels so wrong but despite that I still try and just accept it and work towards making it a better thing to inhabit and feeling less foreign, but it’s a very long process.