umm the back seats arent very heavy, especially considering you'll only be able to get the cushion off the bottom part. Under the cushion, there is a metal peice that is shaped like the back seat so..
What you have to do is push the seatbelts back through the holes and pull from the crease of the seat.There are two metal, funny shaped things that go into the metal from the cushion. As far as bolts go I cant really remember whether there are any bolts you have to take off to get the bottom cushion off, but they should be easy to get to with a 10mm socket. For the top, I know for the two side parts (not the 60-40 split), there are two 10mm bolts that sit on top of little metal hanger type things at the bottom so that then you undo the bolt, they just pop off I believe. Im not really sure about the 60-40 split part, I havent gotten that far with taking my interior apart. Hope that helped.. Gimme a few seconds, i might be able to take a few pics with my phone..
also everything gets louder as you start removing things.. keep that in mind..