Often I have a few things I know I want to say, but I never practice saying them. I'll either make a list on paper or in my mind. Sometimes I write a monologue to read, typically when whatever it is happens to be difficult to say for some reason and I haven't been able to say it for several weeks despite thinking about it. A lot of times we don't end up discussing anything I plan on talking about... my current therapist is a lot more chatty and in the moment than some. My ex therapist would start each session with "what's been on your mind?" giving me a super easy opportunity to unleash all my prepared material.