There are many things...
Not that I know all the details, but I have learned many. First and foremost, APPEARANCE.
Do you "look the part"? Properly attired, do you look like you want to be there, in that gym, officiating THAT game. I believe you should read: StartOfficiating.com; especially the #2 the "Gearing Up" segment.
Other observations: Showing confidence comes from a STRONG WHISTLE when you make the call is the first step in communication. CORRECT mechanics continue that process of communication: to your partner, the players, the coaches, the timer and the scorer's table (and knowledgeable fans).
And the obvious, KNOW THY RULES. With this quality, you can be confident in your clear, CONCISE response to any questions about your judgement.
HUSTLE, HUSTLE, HUSTLE. Be in position to make the call. However SLOW DOWN (STOP in the appropriate location) when reporting information to the table. The game does not continue until you are ready to go.
Other major "givens" are maintaining EYE CONTACT with your partner prior to putting ball in play, and keeping your focus in you PRIMARY AREA.
Hope this helps.
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"Stay in the game!"
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