Honestly, I'm not worried or stressed about the Triduum music, because they are doing exceptionally well with many things, and I can cover whatever needs extra support. I just don't want THEM to be discouraged.
I try to make it a point to mention somewhat frequently that I deliberately program things that are just beyond our reach, and that being free to fail on a piece (that is, to have to pull it from a program, even at the last minute) is part of safety net that lets us push into material we otherwise wouldn't try --- and that most of the time, we end up doing things we didn't think possible.
One thing I always tell my schola is that this isn't a concert - we'll be able to try it again next week or next year.
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