For things that people don't want to do in hypnosis, "cheating" can be used instead of abruptly asking them to do anything. Like getting him undressed. You can say, "You're going to take a shower now, so take off your coat first ~ ~ ~"
The so-called "post-suggestion" after hypnosis is also controlled by the hypnotist. You can call him: what will happen in the future? A person's conditioned reflex can be formed after repeated hypnosis. It can be kept for a while, but the effect depends on the individual, and some people keep it for 2-3 months.