I taught English when students were mesmerized by a professional hypnotizer. Now I sometimes consult people to code them into positive mood after breakups or because of infidelity. The process is long and tiring. I am not sure whether the work might be easier when they are hypnotized.
It is not that easier. It takes so many times, patience and mistakeless work and so many of practices. It is really some mysterious task. As long as it has been done for good purpose it is far better.