The biggest issue I had doing the installation was removing the CRV fascia to access the installation points. Blue Ox (and probably others) give excellent instructions that your nephew could easily follow.
I used a 6 position receptacle mounted to base plate, ran the 4 wires under the car for the lights and a 12v charge line (fused) to the battery.
I just added extra bulbs to the blank space in the upper taillight fixture.
For the Brake Buddy, I added a new 12v receptacle under the dash and got power from an unused, always live spot in the fuse panel.
Ours is 12 CRV, but almost the same as a 14.
Ken