I have the inserts from
www.mustangworld.com and they were a breeze to put on. You basically just make up a soapy water solution in a squirt bottle and spray the area down real good then apply the decals. The solution allows you to adjust the decals until they are just the way you like them and then it evaporates. As it's drying you can press out any air bubbles. I have had mine on for about a year and a half and even after many heavy washes they have never peeled.
Good luck,
Brett
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66 Tahoe Turquoise Coupe
Laser Red 96GT Ragtop
30 Years & 30 inches apart in the driveway!