let the stuff soak in for a night, then get long extensions so you can put everything you got into it, I did mine on my garage floor with ramps so It can be done Im 6'2" 200 my butt fit under there and got it done, just have patience. I used this stuff called Tufoil, let mine sit for two days and they came right off. also make sure you haveone of those universal joint lookin things for your socket it will help you get in there better.
Oh yeah make sure you soak the hangers too. or if you know you're not going back to stock and your kit came with new hangers cut em off with bolt cutters, it saves a lot of time
Good luck