How do I remove the rear speakers on my 2002 Nissan Altima?

if you can, pull the back seats down and look at the carpeting in the rear of the car where the speakers are. There are possibly going to be plugs that you can just take out with a screwdriver, and then unscrew the speakers out and replace them. If you can't pull your rear seats down and the speakers are in the door, then go to google and figure out how to get the door panel off. Be careful so you don't ruin the door cover or weathering strips when taking off a panel. It's pretty hard the first time but you can get the hang of it in a couple tries. Good luck.