Well i worked on one lens for about a week lol just messing with tints because ive never messed with vinyls before. I bought a plastic squeege you can just use like a plastic credit like card. But theres this spray adhesive i use that i love that makes the job 20 times easier called Rapid Tac Application Fluid. I think Rvinyl sells them.
Basically what i did was i bought a tint kit for the headlights and fogs, in the darkest tint i could find online. Since the lens of the fog light is actually bigger than the opening in which you can see the lens through, its hard to mark where to put the vinyl. Especially since its not gonna be the size of the whole lens. So i just applied the headlight vinyl to the fog light, took a razer blade and cut a square frame to take off the excess vinyl. Dont worry you wont see the scratches anyways. Then i bought these other vinyl tint covers i believe from Rvinyl.com. They are smaller than the cut out vinyls i made, so i just centered them as best i could on the lense, with the rapid tac again.
If you get any creases or wrinkles try to slowly stretch the vinyl to fit the curved surface that is causing that crease, or try to squeegee it away but dont make it worse by applying too much pressure. You can always take both vinyls off if you mess up and just try re applying them.
I had to use a blow dryer to get a bubble out of my break light tint, but be careful its easy to mess up the rest of the vinyl if its too hot or you heat up the wrong area.
Taking out the fog lights isnt that hard. Just take out all the plastic pins on the wheel well cover and then you can see the lens the bulbs the housing and there will be a rubber part that fits between the bumper the lens. There are two more plastic pins that are extremely hard to get out with out using a screw driver and another finger to pry them out or just using pliers. They are on either side of the housing holding the lens to the housing.
Then there are 3 screws one in front of the lens in the bumper, one under the housing of the lens, and a 3rd further in the towards the center of the car thats kinda hard to find, just feel around for it. Also remember turning the wheel of your car helps make this process easier of course 8).
After that all thats left is to unplug the bulbs and take it out. I actually left the 3rd screw in the housing on one of mine and just swiveled it over and pulled the lens out. Just be careful because you might wind up with the problem im dealing with im just in too much pain atm to go try and mess with the adjustment screw.
Hope this helps, feel free to ask away 8)
