I've not had mine long and my rear seats are already out! It's quite simple really:
Before removing, get underneath the car, find the exposed end of the 3 bolts and soak them in penetrating fluid (wd40 etc). The outside 2 are on the leading side of the rear springs as you look underneath.
Use a 17mm socket and a T40 torx bit as mentioned above for the bolts.
Once the bolts are out, find a nut to run along the thread of the bolts. Then, take a dab of copper grease and clean up the thread of the bolts.
Insert them back into the car (work them back and forth if the thread is still a little stiff), then once they pop back through the body, get back underneath and stick a little blob of waxoyl on the protruding bolt to prevent them clogging up with too much crap again.
Simples!!