I took my whole bumper off to do it. Going to be swapping them again (for some with a different paint scheme) so tempted to see if I can take off my current R grills without taking the bumper off. As I did not enjoy taking it off.
im not kidding when I said it was easy, Jack the car up take the wheel off, there were 7 or 8 screws to undo, take the mud protector off and push the grill clips while someone pulls from the front. Probably not as easy to do on your own, and there is a risk you might bust the clips on the grill since you can only get to three of them from the back. But once you get the corner off the others come off nice and easy.