Shouldn't be too bad. Just need to run wires up the A-piller to the headliner.
1) Constant +12v (already there with the dome lights)
2) Accessory +12v
3) Reverse signal (disables auto dim)
4) Headlight signal (enables auto dim)
I feel like I am forgetting something. Someone else will probably chime in if I am.
It is not hard at all, just pay attention to the directions. The wires will run on top of the headliner and down the A pillar to the IPM (fuse box) under the dash. Just be careful when you crimp your wires into the scotch locks because if you have the wires backwards then you will have some crazy problems like the mirror always staying on or your radio clock always displaying even with the key off. I have even seen the interior lights staying on because of the wires being crossed.