I installed the Draw-Tite 75709 hitch and wiring harness this weekend. The hitch took about an hour, and the wiring harness took 2 or 3 hours. I had a hard time fishing the wire through the engine compartment, and I tried to run the wire like Ford would, hidden behind plastic and zip-tied to other wires. The hitch installation was very easy, but you might want a friend to help you hold it while you bolt it on.
Here are two pics that I submitted to the etrailer website.