This morning, I sat through a lecture given by a woman who is one of the top 5 editors in Canada. (which is apparently quite the accomplishment...) She had lots of helpful advice about jobs, but one thing I remember her mentioning was how a good editor knows when to change things and when to let them be; clearly it requires knowing what and who you are working with. (like there...I just ended a sentence with a preposition.) Not actually grammatically incorrect, though widely considered to be, we use things like this in speech all the time.
On a different note, it's curious to me how in choir practice, I can hit a high "a" with relative ease, but when practicing with smaller groups, I can hardly hit a 4 notes below that. It probably has a lot to do with how much more I warm up with the full choir...but it still seems odd.