Sketched about applying your new graphics? Don't be! Wacker's installed more kits than he can count, and in this video he walks us through the process.
Always clean the plastics, even if they're new. New plastics sometimes have an oily film left over from the molding process, which can prevent the adhesive from working as well as it should.
Line up two points of the graphics to the plastics and lightly tack the center of the graphics to the plastics. Don't press too hard, you want to graphics to stick just enough to stay put, but not enough to fully compress the adhesive.
If things aren't aligned correctly, pull it off and start over. As long as your plastics are clean, this won't damage a thing!
Once the piece is aligned correctly, press the graphics on firmly, working from the center out. This allows the air channels in the adhesive to work, letting air escape outward to the edges of the decals, ensuring there are no bubbles.
Plastics can vary slightly, so don't be scared to trim off edges if they hang over corners.