A hypnotherapist could arrange her hypnosis session in a way that gives the client confidence and get more familiar with hypnosis.
It is sort of like an orientation. You begin with a Pre-talk to find out the client’s issue. And you deliberately put your first session for every new client to be a Confidence/Positiveness session.
Not only does this gives them confidence about themselves and hypnosis, the familiarization forms a base for the client to look forward to the subsequent sessions. The subsequent sessions will deal with the main issue that the client faced, such as stress or eliminate alcohol addiction.
Just be sure to explain how you intend to go about the hypnosis session to your client before the session begins.