What used to throw me off, we get the song sheets and I look it over and get everything worked out. When we meet for practice the pianist complains that E has too many sharps , can we use the flat? Of course the singers don’t mind so I do my best to go along. The problem is I can’t just use a capo if I’m already playing E so I spend practice relearning the song .
I solved the problem by learning certain songs in two different keys to anticipate the change.