Mine went easy, I didn't loose any fluids, and it took a lot less than 15 hours, maybe 4, possibly a bit less.
There are 2 bolts on the top that are 12 point inverted spline that take a 12 point metric socket. (there is no way to use a combonation wrench in that area) They are up there by the crank position sensor. I replaced mine with common bolts when it went back together. You might go out today and buy a socket that fits them.
Go out today and spray anything that looks rusty, especially the exhaust studs where the pipe connects to the exhaust manifold, also the crossmember/skid plate bolts. It's just a nuts and bolts project, nothing difficult.
You ask, what is the procedure if bolts bust, put the rest in and take your test drive down to the store and buy new bolts..lol
Why are you changing your clutch? how many miles?