I'm not saying to do any of this, but I've had the same thoughts, especially about my friends.
These are the insane things I've been working on for years to deal with this: 1) document with explicit instructions & numbers & addresses for death admin - I've also saved up money on visa gift cards to contribute as much as I can to dealing with my body and memorial and also listed the people I know with the most money to ask, 2) spoken to other suicidal friends about how I'm feeling, especially when I'm not actively wanting to die, so they can spread that info once I'm dead, 3) a lengthy note, which is dated over years, to show that this is a *me* problem, not a them problem, 4) I prepped for a psych ward stay so when I got out and killed myself they could blame the system instead of themselves, 5) special things I've collected with names on them in multiple boxes, 6) started a digital archive of all writing I've done about wanting to die since I was 8 years old.
These are some examples. Essentially, minimise admin for them and communicate through actions that this decision was not impulsive, that there was nothing they could've done, and I've been fucked the whole time.
Probably helps that both my parents are dead though, and they're the ones who actually have responsibility so,
