there is actually an easier way to do it also...
if your radio is a fairly new one...you can buy "smart cables"
one is for your oem harness...it has a universal plug on it...and the other one is for your aftermarket radio...it plugs into it and has another universal harness, they plug together and you're wired up...
you can get these plugs @ circuit city
hope this helps some...
if you need tips on how to get your radio out pm me... i am a sales counselor @ circuit city so i know a little bit about installing, and if i don't know how to do it, someone i work with does...so just le me know
hollatcha
mike