Take a look at the faceplate and see if there are two holes about 2 inches apart on each side. If so, go to WalMart and buy the removal tool for abut $3.00. It will take less than a minute.
It costs a little more than Ron's solution above, but Crutchfield.com has kits that include wiring harnesses and diagrams. I used a similar kit for my 91 Mustang GT radio and alarm system.
Same as any other car , you just start taking it apart till you remove it . if you have never done it before you learn from your mistakes .
the tool is only about 3.00 from walmart also the wiring harness is only about 6 or 7 dollars you could also just use peices of a coat hanger to stick in those holes too save you a few bucks since youll probly never need them again!