Fishing line and a 3M 03612 Eraser Wheel on a drill is all you need. Just be mentally prepared for what could be lurking underneath!
It's got adhesive tape on the back of it. There are two small plastic alignment posts that you'll have to break off.
I centered the plaque and put a piece of tape on both the plaque and the tailgate so I could find center again. Up & down is easily found by aligning to the bottom of the tailgate lip with your fingers. Pull off the backing tape, feel for alignment to the tailgate bottom, align the tapes, then press it on. Easy peasy.