In some cases, all four techniques can be used together in multiple sessions and the order of use is not relevant, but you should also keep in mind that not all three techniques need to be used together.
And in other cases, such as phobias, we use only the ONS or the DN, which is determined by the psychologist or therapist as the therapy progresses, however, when the conflict proves too difficult, a regression through HM or a mixed technique of classical and heuristic hypnosis is always highly recommended