This may be common knowledge for some but I see a lot of people pissed about screen protectors when applying them and getting dust under the screen, which causes bubbles. Don't worry about it, make your first priority getting the shield on and aligned how you want it. When you are done and it is centered perfectly, take a piece of scotch tape about 2 inches long and place half of it directly on top of the screen shield (it should be pretty sticky scotch tape, the matte stuff isn't usually sticky enough). Once you have pressed half of that 2 inches on the shield, get another small piece of tape ready in the other hand. With one hand, lift up on the tape you have pressed on the shield (the other half that is hanging over the edge) and slowly lift up the screen protector enough to get to the underside, and with the other hand use the tape you have to blot and grab the pieces of dust that are stuck on the screen shield. Basically you are lifting the shield up with the tape to avoid getting finger grease and prints on the bottom side, and while lifted the other piece of tape easily removes annoying annoying dust spots. I do this until I get every little speck and always end up with a dustless, bubbleless application.