Very subtle suggestions can be introduced during light trance to great effect. Generally a subject during therapeutic hypnosis feels much the way they would at the end of a yoga session, or after some activity in which their mind was very focused and relaxed. People slip into trance when doing yoga, driving or even programming. Any time that you loose track of time, and find your mind drifting, likely you are suggestible and in trance. A competent therapist will use that moment to introduce suggestions that will benefit the subject.
Trance comes in many shapes and sizes. It's a beneficial experience for everyone as you tend to release the tension and anxiety one picks up in daily life, during trance. This is one reason some people find driving relaxes them, or painting or playing the piano. At Vancouver Hypnotherapy we experiment all the time with different types of trance. As a result we find some interesting ways to help clients.