Custom Stickers are easy to install and can be done by anyone. Just peel off the backing and apply to surface. On larger vinyl graphics, it is best to start by applying at one end and working towards the other. Even when you follow the instructions you may experience some air bubbles. Smaller air bubbles will disappear in a few days, larger air bubbles can be removed by simply poking them with a needle. Vinyl decals/stickers generally will not harm surfaces but if you are in doubt, you should apply to a similar inconspicuous surface to test. Factory painted vehicles and glass surfaces need not be tested.