To remove the stock radio you need to remove the 2 screws holding your panel with the trunk release button, they should be towards the top (closest to steering wheel) on far left and far right, Once...
to stereo question.
Only if you are wanting to keep the car bone-stock. Otherwise, any reputable car stereo installer can fix you up with a new and much-improved stereo system that will in no way...
If they are regular hubcaps, carefully pry them off with a screwdriver or other similar tool. If they are wire wheel caps, you will need the special tool to unscrew them from the center hub.