I did this a couple of years ago as well. Be careful taking it to a stereo shop. I informed the stereo shop I went to, the only one willing to do it, that I had all of the wiring diagrams indicating how to rewire everything and they still wanted $800, not including the install of a headunit. I said no. It took me about 2 hours to rewire everything, and that was having to clean up the mess that was done by the previous owner tempering with the dash wiring. If you go down that road, just make sure they give you some type of warranty and deal especially if you have them install a headunit for you. Also, make sure you get a quality headunit. I purchased a cheap android headunit that is not the greatest in terms of reliability two years later.