My wife and I made it through 3 out of 5 baby classes before we decided to stop going. She just wanted to her about the labor process and had no interest in sticking around for the hospital tour class and whatever the fifth one was supposed to be about. Don't worry so much about plans; it's better to just go with the flow. You'll figure things out.
My wife and I have trouble releasing control to others in general, but when it comes to something like our babies it's going to be even tougher. They do know best, and we've just got to remember this and go with the flow, like you said.
BUT!!!! I want to know all the crazy possibilities before hand. With twins it's just not a simple process.They "have plans" before I even arrive. I like to know enough about "those plans" ahead of time to be able to tell them to forget it on certain things-- other things are what they are.