Inside the car I removed:
Back seat (upper and lower cushions)
Rear deck cover
Trim surrounding the passenger side rear quarter glass
Both sunvisors and their retaining clips
Passenger side grab handles and coat hook
Under the hood I removed the trim piece between the grille and the core support (it's held in place by 3 retaining clips) and one trim "plug" that was holding in a rubber splash shield (to mount the air temp sensor to.)
Installation was a breeze! I ran the wire down the passenger side of the headliner and across to the front, so I don't see how it'd be a problem if you have a sunroof. Once you get the visors and grab handles out of the way, the headliner will move down enough for you to fish your hand up in there.
Here's all the info you need regarding DIC installation. Total time start to finish was ~3 hours, but I spent a good 1/2 hour of that searching for my good utility knife, so maybe it'd take you 2-2 1/2 hours without any distractions. I also saved time getting the upper seat cushion bolts out and back in by using an air ratchet. If you do those by hand, add another 1/2 hour...