this may sound newbie but how do I do it, I've trying peeling the corners of the screen protector but it just won't come off. its like stuck like someone super glued it or something. It was the second layer of another screen protector which I took off easily but this one just won't come off. I don't wanna use a knife or something like that because I might scratch up my screen. any ideas? or is the screen protector gonna be stuck forever.