I don't seem to have trouble with app'ts......my T and I work out an app't schedule for the next couple weeks, especially now that I do 2x a week, so that I get the slots that work best for my schedule. She wants to keep it consistent for me....
I know she has a bunch of other clients, but she does seem to have flexibility in her scheduling for if I have to change or have an urgent need. I'm thankful there's never been a scheduling problem (except for the time she wrote the wrong app't on my card and put the correct time in her book and then called me wondering why I hadn't showed up! )