Rear Seat Bottom:
You would have to first remove the bottom portion of the rear seat. It is simply held in by two pop-in retainer clips; one on either side. Lift up on each corner of the bottom seat until it pops out of its retainer clips.
Rear Seat Back:
Once the bottom of the rear seat is out the back of the seat is next. It's easy to unbolt but hard to get out. Unbolt the four bolts located on the bottom of the seat holding it in place. Some people unbolt the seatbelt clips. I did not. The seat is held in place by clips on the top of the seat that slide in to place downward when putting the seat back on which means to get it off, you need to lift, rather hard I must say, to raise these clips up and over their retainers. You can remove the headrests if you think it'll make matters easier.
Rear Deck Lid:
The deck is a pain in the !Removed! to both remove and reinstall. It is held in place by two different means. First remove the covers to the three tiedowns on the deck lid and unbolt them. This might also be a good time to make sure the seat belts are out of the lid fabric and hanging below it. Second, and this is the pain, you need to unclip the sides of the deck lid. The lid has four slots, two on each side. Into these slots slide plastic tabs that are connected to the car on each side. I removed the tabs a pretty dirty way, I used a screwdriver to weasel my way under them and pull the lid out. It took a little while but I got them out. The deck lid now just slides out once you unplug the brake light.