I had a friend of my father (who has been doing this stuff hardcore as a hobby for years) run the wires (pwr, rca, gnds,etc.) and he setup the amp/freq xovers.
Actually, I was into it with all the door panels off, HU installed, and just felt WAY too overwhelmed as far as where to place all the wiring/amp stuff. So he did me a favor, and helped out. I must say, looking back, Installing the HU seemed to be the easy part for sure!
Steve