Before you replace it check the wire bundle that runs down the driver side hinge. My tail light quit working and I found broken wires caused by cycling the tailgate. If you actuall need to replace the light it is not very difficult. Just gently pry out the molded plastic cover over the third light that wraps around the rear window in the tailgate. It is just clipped in. This will expose the light in question. Removal is very straight forward.