My advise would be to wait a few days before the session to include anything that you didn't think of when booking the session. You are correct not to, as you put it, pepper her with random questions or concerns. In regard to the blindfold request, it is entirely acceptable to share your desires with a paid professional. But, remember she is a paid professional for a reason. While sharing your feelings on the session, I think you'd be best to let it be known that details like blindfolds are up to her discretion. At some point, you've got to let your feelings be known and, with the exception of hard limits, hand over the reigns to lady whom you've booked with.