In context, I’m asking about the DCNH system or something similar. Primarily, has anyone here experienced a subtype change that they know of? If so, how did it happen, and what happened during the change?

Secondly, can a person change their subtype by using the functions involved repeatedly and over a significant amount of time? Is it difficult to do so? Is it only behavioural modifications, or does one also have to change some of their thought habits?