The first time I did it I had to reinstall it 3 times before I got it right and rattle free. Be very careful removing it. A Haynes manual will show you the way...
My car rattles if there is bass, like heavy bass. But the drone of my exhaust overrides all else, and the mechanical hum of the driveshaft due to my lack of rear seats and insulation.
Its quite easy, take out the door bezel and the handle bezel. Unscrew the two screws. Take out a christmas screw thing and then lift. Its fairly daunting.