There are informations about the SN in the pinned topic (resources) in this forum, and in the PPH 2022 (also pinned, link to a book in pdf). Author of the PPH seems to be a scum, kinda, and I don't really trust him, but that's a start to learn a bit. Stans Guide (in the resource thread) seems to be a popular resource too the information from PPH and Stan are somewhat contradicting sometimes. Unfortunately we can't get a text from the other side "I did this and that, it was smooth, 10/10 recommended"
We know more about methods that are one were used for killing people for example for euthanasia (Nembutal) or executions (hanging). Getting Nembutal now is not a thing to most people now (global shortage even for approved uses like euthanizing pets, internet is full of scams, N is a scheduled substance), so here we are.
As I said, those resources on SN aren't perfect, because of this sneaky kinda criminalizing suicide and censoring stuff related to it for the sake of "prevention". Still it's a reasonable courtesy to learn about it yourself before asking questions. It's a pro-choice forum, so it's full of resources… of various quality.
Of course I encourage you to make those decisions when sober and sane enough to make so serious decisions. I hope you will find a way to find your life meaningful and enjoyable.