There is a trick I learned years ago about getting a successful installation of protective glass screens, it is to wipe the screen down with 99.9% Isopropyl Alcohol. I am not talking about the wimpy alcohol pads that come with the screen protectors I am talking about 32 oz bottles of 99.9% professional grade Isopropyl alcohol, and a soaked cotton ball. I first place the device, in my case up till now iPhones, on a damp kitchen towel this grounds out any possible static electricity build up that will suck in from several miles away that one cat hair that will ruin you installation. Wipe down the screen you know you are going it right when you have visible liquid alcohol on the screen as you wipe. With the screen wiped off just sit back and let the alcohol evaporate. When dry blow it off with a watchmakers blower and you will get a good installation of the screen protector.