It's not "hard" but it is time consuming. That was the longest part of the job. From the rear of the truck you go from the drivers side tail lamp, across the top part of the spare to the pass side. Over the exhaust, cross back over to the drivers side above the t-case, and snake it up between the drivers side exhaust by the inner fender, behind the master cylinder, I tucked it down into the fender, and to the fuse box/battery. The hardest part was fishing the blue wire into the cab area, and it wasn't that bad, but you'll want a fish tape to do it.