Preparing to try self-bondage for the very first time

Hey everyone im gearing up for a first time in self bondage, my collection has become larger over the last year and after reading stories and getting ideas I think im going to try it this weekend, I have a latex catsuit, corset, tall leather posture collar, wrist-ankle- thigh cuffs all lockable, a home made spreader bar with a impaler attachment using a nice dildo for my arse, and a tens unit. I have my key for my locks froze in water with a string attached and I also have a cylinder made up that I fill with water and freeze it for a back up, Im using rope ratches to pull my arms up above my head with the spreader bar keeping my legs spread, after some trial runs I should be free in a half hour or so, anyone have any suggestions?