how to install a large vinyl sticker on shop glass door

how to install vinyl graphics or Shop door tickers. Technique used is a installing each side of the graphic at one time. If installing a smaller vinyl decal, then the hinge would be at the top of the sticker and then squeegee down instead of across. And at the same time lightly brush out the air under the sticker. Then you will see that the whole sticker sticks nicely.