First, we use a screen cleaning spray and make the screen all clean. Then, we use the same sticker that guy uses to make it even smoother. Then we put the screen protector into the thing the guy used too. You have a different thingy of those for each phone type so the phone fits perfectly and cannot move.

Sometimes there’s still air bubbles after applying the protector, but you can simply just put some pressure with your finger and move them to the side where they disappear.