Only thing I would add to above, is if you are feeling lazy, it is possible to run the wire into the car without removing the kick panel inside. That is how I did mine. Then again, I feel it would have been 3x faster if I had removed the kick panel.
What do you need to run wire(s) for?
For Power/Ground you can tap the 12V ACC/cigarette lighter plug, its kinda a pain to open the dash up, but its an easy power source, just add a fuse and you are golden.