Here are the tips:
1.Clean up the dust on the screen with the clean kit included in the package.
2.Tear off the protective layer from the screen protector. Be patiently taking one hand to hold the screen protector (4 fingers on top, thumb on bottom.)
3.Hold the screen protector to get close to the one side top and bottom.
4.Make sure the screen protector sides are all aligned against the navigation screen sides, no gap please. Then press the screen protector to the other side, to make the other sides of the screen protector are aligned to the navigation screen sides. Remember pushing all air bubbles out.
If you didn't make it right in the first time, don't worry, tear it off gently from one side corner, and don't let any dust in, you can give another try untill you stick it all right.