Just got my SGP Crystal from Webbyboy today. Two thumbs up to him for his service and price! By looking at the drawings on the cover, I installed it by removing layer 1 (top layer) first. You should remove layer 2 incrementally as it is below the actual layer that is applied to the phone. It's quite simple actually, just stay calm and do it when you're in a positive mood!

Have good quality scotch tape on hand to gently pick up stray dust or lint, or to re-align your screen protector.
How to know if the orientation is correct? The small hole in screen protector should be on the top right for the front facing camera.

Easy peasy.