Spray the glass and the back side of the sticker (the sticky part) with water... then place the sticker on the wet glass. The water will let you slide the sticker around and get it into perfect position without the sticker sticking. Then when you have it perfectly lined up squeegie out all the water with a credit card or something like that... the sticker will stick perfect and shouldn't have any bubbles or anything. Applying a sticker dry is too easy to screw up.