I pulled the old tapedeck out of my hyper speed ford escort station wagon and installed a a cd player using the existing speakers...took about 2 hours and a multimeter (just to make sure which were voltage lines vs speaker lines)..it wasn't too bad..seems you have the basic knowledge...
If bestbuy wants to sell you the remote thingy..they are selling you a multi-disk player with an amplifier...get a single sidk player and a visor holder for the cd's..
if you have access to a tone generator, you can map out which wires go to which speakers..unless you're putting in a new system (speakers, amp and everything), then come out here to Omaha, we'll go to the lab and abuse the test equipment
Mike (winter in Monmouth sucked when I was there)