The degree of preparation is really up to your discretion. Still, I would recommend writing notes to some of your loved ones or maybe preparing some explanation to people you know who would inevitably find out that you CTBed. It would also be good to decide who gets which of your belongings if that's something you care about. Cancel all of your paid subscriptions to things. If you want to write a will, that's absolutely a good idea too. In the end, the point is to try to trim off all your loose ends before you go so that you minimize the negative impact of your death.