I did the same thing...under the driver's seat. Installing yourself is a breeze. Just running the wires throughout takes time and patience. I installed the gps magnetic antenna up near the vin# location as there is a metal plate for it to stick to.
Also, check out the following link as I posted pics of where the speed sensor wire is located to splice into. Believe it or not, THIS was the "hard" part.
http://www.vehicross.info/forums/sho...4&highlight=n1
Anyway, good luck and have fun with the unit.
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www.aftershockproducts.com