Same problem here!
Though I managed to get rid of almost all friends. The thing is, when you just stop giving them your attention, refuse to go out, don't pick up the phone when they call etc, they forget about you peacefully, I've done that.
Why almost all friends: because I can't afford renting apartment alone so I had to make new friends, but they won't suffer when I ctb, I made sure they knew my philosophy so my ctb won't surprise them. Sometimes I even feel that I put too much effort in explaining to them why life is horrible in general, I might have made them a bit suicidal too
Big problem for me are parents. Naturally they (in most cases) don't give up on you no matter what you do. Nevertheless I make progress with them to. I haven't visited them for 4 years now, I never call first, picking up the phone 50/50 when they call and don't talk long (when I don't pick up I text them that I'm ok, but a bit busy). With time they called less and less, now it's about a 10min talk once in a month, and I can see how the bond between us is loosing.
Also I think suicide note can make a big difference. Try to put your best arguments in it, so they may understand you. And don't forget to say that it's not their fault (even if it is), that's important .
Also I have a gf to break up with (peacefully), but that's another big problem, and it's not in your question, so I won't elaborate on that.