I would buy a Haynes Repair Manual for your vehicle. They are great books to have, and will show you how the radio is installed right down to the very last bolt. You can find them online (at the link I provided), in most automotive stores, and sometimes at your local library. ;-)
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On newer vehicles like that the head unit is built into the face of the center console. You will need to remove the entire center console from the dash to get at it.