I would think there should be a general warning against deliberately promoting the effects of dissociative identity disorder etc, without adequate medical supervision.
Technically, making tulpa would be considered DDNOS, except that the new definition exempts shamanistic practices. Making tulpa is a shamanistic meditation technique practiced in Tibet for the purposes of self-discovery. It takes years of focused practice and concentration, but self-hypnosis can help some.
This modern resurgence of tulpas seems to be trying to find faster ways to make them, with less then years of effort. The evidence for success in this is so far anecdotal. I would advise caution - this is not something that would suit everyone.
I have made...
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.