How difficult would it be to install the digital rear view mirror. I noticed that the option was a 200 dollar add on but I was shocked to learn that only like 10 percent of the NXs have them. How difficult would it be to install one myself?

 

Look like it's feasible, but not ease, because you will probably need to change or add parts (camera module maybe) to the external mirror as well, search these parts

Interior Rear View Mirror

Part Number: 878400W060
Supersession(s): 87840-0W060

 

You will need wiring to the back liftback for the camera module.