Tips for starting sharp?

[Splute]

I believe he must be referring to goal tending. that is the only call if the ball is NOT in contact with the rim or imaginary cylinder above the rim. Since the op refers to hitting it off the glass; I am going with goal tending.
Now specifically to his question regarding tips.... I have not been doing this long enough to interject any pertinent info, other than to agree with the comments about pre-game communication. In fact I discussed this issue pregame of a 10th grade boys because it was the first game in which their was actually the possibility of this happening (tall, agile boys). didnt come up during the game, but I thought about the possibility pre game and had my mind atuned to it....