It's pretty technical, the dealer gave me an instruction sheet for replacement of the cup holder when I did mine. IT would take a good mechanic 1 hour to install this, $400 is really high for something this easy. There are several items to be concern with, boot for emergency brake, power mirror switches and air line for storage lock are tricky and time consuming. Knowing this it should cut the job down to 30 minutes.
The cup holder is a waste of money! on top of that.