I don't think anyone is that confident...at least I hope that they are not. Even if cryonics itself works there are so many other reasons revival would never happen; I outlined them near the bottom of the thread related to my original reply to this post already so I won't do so again. Suffice it to say, even if you had 100% confidence in both cryonics and future revival technology, you cannot have nearly 100% confidence in actually being revived.

But if you are young and healthy and want to be preserved intact you can probably figure out how to do it; but it is risky and you need to take precautions which I don't know the least thing about... The last thing you want is to end up under a scalpel on a medical examiner's table, which is what often happens to people who die suddenly or violently.