-Make a spreadsheet with the entire year's music laid out in advance
It may help to be in a separate choir yourself just as a member, whether it's a community choir or a diocesan choir or something like that. Apart from my own experiences, I have learned the most from two things, first by being the accompanist in a choir, then by being a member of the diocesan chorale. I watched the directors and if I experienced something I liked, that I saw choir members respond positively to, then I tried to model it.
Organization and Planning well ahead in advance is key. While writing this, I have basically every mass planned through Pentecost.
Adding to this from my own experience: Dare to deviate from your plan when you feel necessary; this will become more frequent over time.At choir rehearsal, plan your whole rehearsal in advance (plan more than you expect to have time for, always easier to cut than to improvise), try to stick to your plan.
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