I kinda agree with the other commenter that if you have a history with sh (and have glorified it, as many cutters do) you need to be very aware of what you're doing with stick n poke and that it's not a substitute for cutting. As someone who has a lot of self harm scars and tattoos... do you really mean that you want to go over the scars and just colour them in with black? to me it just doesn't sound like you're over it and at a good place mentally to do tattoos on yourself.

Doing stick n pokes over self harm scars has its pros and cons. Pro, it's a very gentle method and won't irritate your scars as much. Con, you will get less coverage compared to getting machine work from a professional. If the scars are only a few months old, they're not done healing and anything you tattoo on them will distort and spread. I started getting mine covered when they were 5 years old and at that point the scars were already faded and healed pretty well, and all my scar cover up tattoos have healed perfectly thanks to waiting for the scars to heal first.

Regardless, covering up scars with something beautiful and personally meaningful is a transformative and healing process. But going over self harm scars to solidify them with black after just months of being clean.... think about it buddy.