Hello,
I prepaid for my own cremation, since I have no family. Went to local mortuary and told them I wanted to preplan and prepay for own cremation. They give various forms to fill, e.g embalming or not, who will ID body (in my case no one, from driver's license picture) etc. I even paid for ash scattering and specified place, time and how I wanted ashes scattered. They take pictures and send photos as proof to whoever's name you put on the form. They take care of everything. It is a pretty easy process. The prepaid money is held by a life insurance company and if anything is left over after all expenses, it goes to whomever you wish and put down as beneficiary or to your estate. The mortuary might state that every six months or a year price of expenses might go up and you have to pay the difference. In my case, since I plan to go soon, it didn't matter. I just nodded and agreed!
I created my own "MY LIFE" video which will be sent out, along with my goodbye note to couple of people I know. Not many. I created beautiful packages, goodby note letter sealed with wax etc. Packages pre-addressed and prepaid from post office so police can just drop them in mail.
It was rather interesting making own life celebration video. I felt tearful watching it, but not in a depressing way. More that I accomplished so much even with all the obstacles I encountered and that I did everything I ever wanted to do, more than majority of people I know. Watching pictures of all my adventures put me at ease with my decision, which was arrived over many years of contemplation, not impulsively. So putting the video together with all pictures, choosing music etc was a great relief, so was writing the goodbye note, which wasn't a diatribe or regurgitating accusations or sad things. I kept it fairly neutral without even explaining all my reasons.
Hope this helps. Good luck.