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They aren't hard.. if you have the Soap and Water, patience and a sharp blade (just incase) they'll go on with ease. Hell, practice if you need to. Get a 2liter bottle and cut the plastic wrap off of it, get you the Soap and Water solution, find a window or mirror, spray and practice... maybe draw out a shape on the mirror or window with a crayon, and then cut out the plastic to the "about size" of the shape you made, and fit it up.
That way, you'll have a general "hands on" with this sorta thing.
I want the overlays but the taillights probably dont look right from any side angle because the lights themselves are recessed in the housing. They probably look really nice from straight behind but other than that I dont know.