Expect to feel anxious about the first session, and yet allow yourself the room to not make any judgements about it until you are there, in it. New things are anxiety-provoking, but that doesn't mean they aren't wonderful and valuable opportunities opening up. A day from now you will have the fist visit experience behind you.

My T said to "come as you are" and the only 'rule' is to say whatever comes to mind.

Good luck!