Your chances of entering a psychotic case and getting away with any smooth procedure is almost zero. A psychotic can sometimes be so disturbed that you will have to do something desperate like narcosynthesis or using mirrors to attract or fix his attention on something, but this would be Institutional Dianetics.

[...]

There has been a lot of upset on the question of positive suggestion. That is because the positive suggestion definition is very technical. It was overlooked by Reich that positive suggestion means in hypnosis a suggestion which is given to a hypnotized subject which will result in some change in the manifestations and actions of that patient. That is a positive suggestion. The wording of a positive suggestion has the intention of producing an effect upon the patient by telling him something, and is not used in Dianetics. But chatter doesn’t do very much harm unless the patient is hypnotized. The canceler very neatly scoops up the material as you say it to a patient, even if he is hypnotized.

Narcosynthesis and sodium amytal analysis and so on are complicated by the fact that no canceler is given to the patient, and too much idle chatter has gone on around him. So when you have a patient who has been treated with these things, if you go back there you will find everything that was said in place.