You absolutely can hypnotize yourself. You will need to learn the proper way to do it but once you’ve had some instruction it’s very possible to hypnotize yourself. Some people prefer self-hypnosis because they don’t trust another person to hypnotize them and can’t relax enough to get into a true hypnotic state when someone else is around. You can also hypnotize yourself between sessions with a hypnotherapist if you feel you need a little extra relaxation.
When you’re using self-hypnosis though you aren’t getting the expertise and therapeutic help that you would be getting from a trained therapist so if you’re using hypnosis to help you deal with Anxiety, Depression, or psychological issues then you should probably see a professional therapist instead of relying on self- hypnosis.