I only hear it when I get in the car and get out, not while driving. Is there a way to maybe grease it up so it doesn't squeak or do I need to replace them? How hard is it to replace the rear bearings on FWD anyway? Thanks.

 

This may be a silly question, but you're sure it's not the e-brake squeaking?

To answer your question: it will be easiest to replace the rear brake rotors and wheel bearings at the same time. The bearings themselves ride in the brake rotor.

Generally if you get 2 rear wheel bearing kits (one per corner) they will come with inner and outer bearings, as well as the bearing races. The races need to be pressed into the brake rotor - I improvised with a flathead screwdriver and a rubber mallet. Install the new inner dust seal and put grease on it, put grease on the bearings, install the rotor with races, put the castle nut assembly in place (properly tightened), put in the cotter pin and bend it, and reinstall the grease cap and you're good to go!

Might also be a good time to replace the rear pads if they're older.