Hypnosis a process where you are put into a very relaxed, focused state. We bypass your conscious, critical mind and drop in positive suggestions to your powerful subconscious mind. A suggestion give in the hypnotic state is much stronger than the one given in the conscious state because it moves so quickly it does not have time to be diluted. The subconscious mind does not critique the suggestion being given as so it accepts is a real.
When a consistent positive reaction to a suggestion takes place, that reaction will become a permanent habit, and constant willpower and motivation will not be necessary to maintain it.