I just did it in my e36, its a little bit of a pain but not too bad. pop the little black squares on the sides off and then unsrew the screws underneath, pull the deck out and then try to get that SOB clip off with the wires. Mine had some sort of anti-theft lock on it. I don't necessarily reccomend this but I broke the outside sliding part of the wire harness to get it to free, and since I had the new harness ready, it wasn't a problem at all. Snap it together and Voila, there you go. You will need to buy a wire harness and an FM antenna adapter for the radio to work.