My top option right now is nitrogen, because I think I could do it successfully first try and the ease and legality of getting all the materials and ease of having a backup story if I were to be questioned about any of those materials. Only problem is not having a car to get the N2, been thinking about how to get around that...
N would be a top option if it were easier to get.
Would prefer CO over N2 also, but I would want to do it from a tank of pure CO rather than charcol or chemical mixing, and getting a tank of CO is hard to explain away.
Also thought about just going with a gun, one item, one shot, high success, not too much to think about getting it perfect as long as I aim right. Just never been into guns, would want to go practice at a shooting range a few times, then buy one based on that experience, then would need to figure out a remote place to go to do it.
Jumping would be another option, traveling to an ideal place wouldn't be an issue. That one mostly would have other people around though, not exactly ideal.
SN is too risky now in terms of wellness checks. Plus it would be difficult to get antienemics, don't think I could lie well enough.
Hanging calls to me because I could do it any time. It's tempting, always. But suffocating is not for me, same reason I wouldn't go with drowning or nightnight, and there is a high risk of failure.