I've always done it myself. But, if it were discounted or part of the price of buying a new unit...then I would have it done at a big-named shop. If John Smith at the shop down the street is going to do it...I may as well do it myself.
Anyone with tool sense can do a system themselfs. I installed 6 TV's and 12,000 watts of audio in my Tahoe. Research and time are all you need. For the most part you can get pre-made adapters for almost any vehicle so it's just a matter of popping things together. In fact I am installing a better alarm in my Tahoe then I had previously installed, one with infrared camera, window module and relays for the door solenoids (I am also shaving my door handles myself lol) Just remember your Chilton's a comfy seat lol.
Oh yeah and about that "slippery screwdriver" mentioned above, if you don't have the right tools and aren't willing to stop and go buy the right tool then pay somebody else becase as noted above the wrong tool can really screw things up.
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