they arent hard to put on, i used a spray bottle with tap water and dish soap in it, sprayed the caps, scrubbed with a paper towel, sprayed distilled water on them, wiped off, wiped them with the wet paper towel then used the squegee to press the middle of the sticker into the wheel, and squeegeed down to get the bubbles out, then up for the top.. then dug my fingernails into the gap between the centercap and the logo (theres a very fine crack) and used that as my guide to cut the vinyl with an exacto blade.. any air bubbles i poked with a needle and squeegeed in the area