Quick whistle, let the whistle go and hold it in my non-throwing hand (that way I know it's not in my mouth - teaching from an instructor years ago), hold the ball in the other and place myself between jumpers and pause (don't want either trying to time the toss). One-handed push to an imaginary basket like has already been mentioned.
Never purchased a copy of this one, but here's a link of me last year just after a toss:
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