I don't think ego vs. confidence is the question, as if we could control these independently of anything else.
A better focus for officials is to establish habits of reading (rules and cases), practicing (mechanics, self-evaluation), and communication (during games, with fellow association members). These habits are more directly within one's control.
When one is improving in all of these dimensions, a certain confidence will come naturally. When one is still striving to learn, this confidence is unlikely to shade over into arrogance.
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Cheers,
mb
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