Yeah, im assuming your sub is the back passenger side, you need to take out all the little rivets (they grey circle pieces, use a flat head or pliers) they should just come out if you pull.
oh and fold the seats down.
i couldn't get the bolt where the seat belt is conncected so you mihg try, but you can still do it if you cant
there is a piece of the side panel that is under the trip that run along the back just move itout from under it
you may have to pul some carpet back on the sub side to be able to pull the penal off enough to reach the screww on the sub box
i think there is a screw connecting the panel to the floor just look along the bottom it might be under the carpet, and unscrew it,
then basically i had a buddy hold the panel open so i could unscrew the brackets holding the box in
i dont remember where all the screws are you jsut have to look, i know there is a tricky one back towards where the amp is.
if you really wanted it easy you could just unplug the sub once you get the panel off
i know this is long, i hope its helping, you really just have to trail and error.