I just replaced my stock radio in my 02. Not as easy as others i've done, but not to bad if you have done a couple before. I just posted a threat last week. Its called "First modd, non power modd" Some good info in their. Strikeone commented, he used a cable that looks line the factory cable and connected all the wires through it. Read the post and you will understand. Sounds like the way to go. What head unit are you installing, speakers too or no?
Good Luck