The install is definitely an involved process. For the average person, I would recommend taking it into a professional. If you're pretty handy with a wrench and familiar with automotive electrical, then you should be able to get it done on a Saturday without too much difficulty.
I will say that now the install is way, way easier than before if you buy the plug and play OBDII pass-through harness:
http://www.autoanything.com/nerf-bars/a ... gh-harness
They aren't available for all models, but that harness allows you to avoid all the wire splicing craziness that you had to do before, and for $80, I think it's well worth it. I haven't done an install with one yet, but for an idea how much it simplifies the install, AMP states that
the pass-through kit replaces steps 8-41. That's huge. I'm not just saying this as a vendor, but I would not install another one without that harness. It takes at least a few hours off the install time, and it still leaves your OBDII port open to use whenever you need.
Feel free to PM me with any questions!