It's pretty easy...you need to keep in mind is that you want your trailer lights to work the same way your jeep lighting system works. To make the installation neat you want to purchase wire tap-in squeeze connectors from radio shack for $2.19. Connect the wire harness directly to your tail light wiring with the squeeze connectors so you don't need to splice any of the existing wiring. Test the harness by pressing the brake pedal in your jeep and turning the lights on and off and that's it you're done. Then the rest of the work is cosmetics...how good are you at concealing the wires and tucking them out of sight.
