I tried hypnosis one time. It was to quit smoking and was guaranteed to work. It did....for 5 whole hours. During the "class," we had to throw our cigarettes away...so when the hypnosis wore off, i had to go get another pack of cigarettes.
Anyway, since it was guaranteed to work or we would get another free session, I called the number to set up another time only to be told they wouldn't be back in my area for a year and they dont' schedule that far ahead. IOW, rip-off.