Rear light guards are easy. Unscrew the screws that hold them in, place cover over and rescrew back in with longer screws that should be supplied with light covers.
Fronts come with guide papers to get the holes drilled properly.
I fitted mine and they were no real hassle. For the fronts, measure 3 times and cut once as you need to cut 2 holes in the wing and 2 in the bumper per side.
Also, the light guards are on for life. As they leave 13mm wide holes.