Fairly straight forward mate
If it's anything like the Terrano it will just entail entering the rear of the truck tub via a grommet and then tapping into the existing rear wiring loom and running the cable down behind the rear bumper and across onto the towbar and then into your 7 PIN plug
Towbar should just be a case of bolting on. I'm sure there will be a wiring diagram somewhere
if you get to that stage