This will be my first time using a glass protector. The part about having one shot to put it on correctly scares me as I don't have the money to try again and again. I noticed a lot of the instructions say to press down in the middle of the screen after aligning it. Does this mean if you place the glass down lightly, it will not start adhering and you can nudge the sides with your finger till it's perfect? and then press down to start the adhering process?