You just need the tool that unclips & pulls the old head unit out. It looks like a big U. You plug it in the holes on either side of the radio, pull the 2 away from each other to release the clips that hold it in & pull the head unit out. Unplug the wiring harness & antenna & you are done... takes about 30 seconds. To install your new radio, most of them come with a mounting cage that clips in... mount it. Purchase a wiring harness adapter to plug the new head unit in to the stock wiring harness, hook up the antenna, slide the new radio in until it latches in place, snap on the trim piece that came with the new radio & you are completely finished.
Steve