I'd realy like to do this trick one day , but I won't even think of doing it till I have as many identical guitars so that I won't care about losing one of them in case of accident.

I don't think that hurting yourself is the problem, but the fear of losing your fav guitar is like a nightmare.

If you insist on doing this trick, make sure that your strap is perfectly locked into your guitar with a "Schaller" or similar lock system, and that there's enough space for your guitar to rotate.

And be carefull not to hit your bass player :D , Good Luck !