I would respectfully disagree that you have to be prepared and willing to accept a no. Some of my most productive therapy moments have happened when I have had a fairly emotional, seemingly immature reaction to something in therapy that I find painful, unfair, or unsatisfying. Does it hurt? Tremendously. Does my T change her mind or "fix" it? Not usually. But if people can't express anger, disappointment, or despair in therapy, then where can we? I'm not abusive or threatening to my T, but I do tell her exactly how I feel, even if other people would think those feelings are unacceptable, disproportionate, or embarrassing. I am unlearning how to suppress my emotions, and it is the most freeing experience of my life.