Not much. Most of the mounting work is mechanical.
For the electrical connection I could take the easy out and run the USB cord out the back and into some rear USB socket if I was in a hurry and didn't want to find or use some onboard USB connection.
-> But maybe I'm missing something here. I'm beginning to think you want some KIT with instructions. I don't think there is such. But it can be done with common tools in our garage.