Some clients notice a shift after the first session. I see this most consistently with sleep at my Edinburgh hypnotherapy practice, because the physiological effect of genuine deep relaxation is immediate for people who have been in chronic stress or freeze states for a long time. For anxiety and phobias, stable change typically requires two to four sessions. For more complex or longstanding difficulties, four to six sessions is a more realistic expectation before meaningful progress is apparent.
I do not overpromise because a client who has been set up for a miracle after one session and does not experience it has been set up to fail. What I do tell clients is that they will almost certainly leave the first session feeling different from when they arrived. In my Edinburgh practice, that is consistently true, and it matters because it gives the nervous system an early reference point for what change actually feels like.
The Freeze to Forward method I use is solution-focused by design, meaning we build toward something specific from the first session rather than spending weeks mapping the problem. That tends to accelerate results compared to less directed approaches.