Like any therapy it’s quite dependent on the therapist. My previous experience they just told me to speak slower, which wasn’t helpful. My recent set of sessions was more structured, and got into what I stammer on, what I did when it happened (in my case either taking a run up at the word again, or just rewording on the fly to avoid it), my feelings around it, and then some techniques to work on to try and improve fluency. (I have a block, so we went over block modification therapy) It’s not a quick fix, and takes time and work on your part to make it worthwhile in the end.