1) fold down rear seats

2) if you have a sedan, use a 10mm socket wrench and extension to remove a bold hidden between the bottom of the side bolster of the seat back and the back seat. It's a pain to get to and you'll have to squish the seat down just to see it. After removing this bolt, the side bolster can be lifted straight up to slide off.

3) pop the trunk and look under to release the tail light harness

4) get back inside the car and sit on top of the folded down seats. The whole plastic rear deck is one piece that comes off. You have to lift it up from the front enough to pop the 3 plastic clips under it.

5) pull the thing toward you to pop about 7 plastic rivets. You should be able to remove the rear plastic deck now which exposes the metal rear deck.

6) use a philips to unscrew the 4 screws on each 6x9. Detach the wiring harness.

7) replace with new speaker and reverse instructions.