There exist many induction techniques to get people into a hypnotic state. It ranges from techniques that involves the eyes, the head, the hand, the posture, the muscles, the breathing, the arms and so on.
These techniques uses the relaxation of the mind and body or the use of words to put the person into state eg. the word sleepy, drowsy, dizzy etc.
Whether an induction is a fast one (ie it takes seconds) or a long one that takes 20 minutes or so, it revolves around mind/body and words.