It's actually pretty easy - the wiring can camelback onto your existing wiring - pull off your left tailight and work a coat hanger down below the cladding (it'll slide along the inside of the cladding bumper cover or use a fishtape if you have one of the wire type) - use that to pull the wiring back up - follow the directions for the wiring harness and it's a fairly straight forward job and doesn't require pulling off the rear cladding.

-- John