Very easy. Remove the two black covers (above the lights) under the trunk lid. The 3 push retainers:
can be removed easily by prying up on the center piece. Run something under the center piece and pull it up. The top the cover can be removed once you pull the 3 retainers off. Push out on the upper chrome tabs that you can see. A gap will form on the top of the rings. Wedge the plastic tool or something similar (plastic won't scratch easily) into gap that forms between the lenses and chrome ring. Work it out little by little at the outer bottom corners. You can place blue painters tape on the painted bumper so that you don't scratch it.