It is all about habits. Our entire lives, from the time we are young, is defined by our habits. What drives the habits is the not the conscious but the subconscious mind. That is why that is the focus of the hypnotist. An analogy would be with our cars. If the engine is our subconscious mind, where we drive represents our habits and the car body represents the conscious mind. If the car was having a mechanical issue, you would not tell him to perform body work on your car. You would ask him to look at/wotk on the engine.