you don't necessarily need meto to have a successful attempt, but it's VERY recommended. here's some advise / what i'm planning for my SN:
1) prepare *3* glasses of SN. you're probably going to vomit even with antiemetics. after vomiting, drink another glass. even if you vomit several times, there should enough SN in your system to ctb with the sheer amount you drank
2) don't have a scale? 2 tablespoons should be around 20 g. the recommended dose is, i believe, 15 g ? unless you're on the heavier side. slowly add water - you want to use as little as possible.
3) don't want somebody you know to find your body ? book a motel/hotel. bring identification so the police can contact your family. they're going to ID you regardless, might as well make it easier on them.
4) leave notes instead of texting. if you text somebody saying concerning things they will call the police and you will be found. just leave notes instead.
5) it's not exactly painless like it's advertised. should be like a severe hangover - vomiting, shaking. crying, migraines etc. not exactly the worst, but not "passed out peacefully" either
6) READ STANS SN THREAD. memorize it.
i hope this helps !! personally i'm just going to down 3 glasses of SN in a shitty motel & hope for the best :')