Trance is different for everyone, and every person has reported a different experience of it to the next. The best way to explain how trance is helpful to create change in human behavior is if you think about the fact that you have a conscious and an unconscious mind. Your conscious mind is the part that does all of the moment to moment thinking, it's the logical mind, the mind where you might "chit chat" to yourself throughout the day, where you keep short term information.