Sorry for the wow emoji, my phone is crap. As for methods, I can't really tell you much, because I barely have any knowledge about them. My chosen method was going to be SN, but I don't know if it's still possible to get it (thank you, pro-lifers).
I wish I could be of more help, but I'm pretty ignorant myself when it comes to methods of suicide. And, even if I had valuable information, I'm not quite sure I could help you too much, because assisting someone to CTB is not allowed in this forum. I think the most I could do would be to provide such information in a comment.