I hope you NEVER do it. There are so MANY true reports of SLOW DEATH by auto-asphysiations gone WRONG.
But if you go ahed --
> NEVER let the Rescuer(s) - for One Second - leave you alone.
> Have TWO (backup) PAIR of EMT, safety shears there.
> These are scissors having Blunt Ends EMT (ambulance) drivers use to Cut through strangles, clothes and like.
> Speed dial 9 - 1 - 1. Make sure your cell is Charged. Make sure it's In The Room.
> PRAY your Playing With Fire won't end up like it does so often in the news.
Dude, I apologize if I was lecturing. I want you to have FUN. NOT die.