Just rip the whole Mach 460 system out and preferably smash it with a bat. It's not hard installing a system. Running wires is the biggest PITA.
Installing speakers are easy, and a HU install is pretty straight forward. If you've never done it before I'd just take it to a sterio shop and get them to run the wire and install the amps. Installing subs is super easy, just put the box in the trunk. You'll need to get someone who knows what they're doing to set the gains on your amp for you.
There are 2 little holes on each side of the head unit. You need a set of "keys" for this. You CAN buy some, but it's just as easy to cut up a coat hanger and fashion them into two "U"'s. insert the "keys" into the hole until you hear it click, that should be the HU unlocking. Then just slid it out, unhook the antenna, and the harness. Boom, your HU is out. Go to Wal-Mart or a sterio shop and get a install harness, slice the harness into your new radio's harness, then plug the harness into the stock one. Peice of cake, then just slid the new HU in.
Speakers are easyiest. Just take the speaker grill (or in some cases, like my fox body) take the whole door pannel off. Unscrew the stock speakers and then cut the wire. Splice the new speakers in and then screw them in. Super easy.
If you have any specific questions, feel free to ask.
P.S. #1 rule, CC sucks *** for everything car audio.
