lill,

Let me stress something here. Never try self bondage.

There are so many things that can go wrong that even experienced people have been killed doing it. Positina asphyxiation is just one of the things that can go wrong.

I know these things look interesting and exciting, but they are dangerous. Learn as much as you can before trying them, and then only do it with someone you trust implicitly with your life, because you will literally be putting your life in thier hands.