I have always done my own rehearsal schedule.....and other directors I have worked with have done that also.
Interesting.
I hate it because you have to work around "conflicts."
I've always done my own as well. I like it. Of course, with recording, there are only occasional hurdles since the singers are hired for a certain number of days and expected to arrive knowing the material. In 2001, when John McGlinn recorded
Babes in Toyland, we got to London and the soprano hired to sing the role of Tom-Tom arrived with such a cold and vocal issues and she was paid off and replaced immediately. In 1998, recording
The Most Happy Fella in London, our Tony, Louis Quilico arrived thinking he remembered the score from singing the role before. We ended up, for the most part, recording his orchestra tracks and giving him several months to relearn the material. He was a very nice man and once a great baritone, but . . .