You will not have any difficulty getting yourself out of the hypnotic state. You are mindful at all times of your surroundings. Therefore you can stop you session at anytime. If any type of emergency were to happen ie: if the fire alarm went off, you would open your eyes, and be back in your natural state of awareness. Otherwise you will be guided by the hypnotherapist to open your eyes after your session, instructing you to leave hypnosis and come back to your surroundings.