Hey, I was just told the fingerings with no book and I got it in a couple of weeks.

Well, cannonball rocks... You sir are better than Sigurd Rascher... Most of us mortals have to be masters at thier overtone series before the altissimo register will come out! lemonhead, try this: Play a low C, by redirecting your air (not by biting or pinching) and the shape of your oral cavity you should be able to play a series of overtones without changing fingerings. Taps, comes to mind for me. After that they just started coming out!