Please lemme start off by saying that magic is a technology that remains inscrutable to the end user, whereas Magick is a continuum of cooperative entities that cultivates many forms of magic. That is, it is important to have support in certain undertakings.
This question has some tough dimensions to it, because psychic power is a symbiosis of man and nature, and into that mix, we have ancestral, fey, elemental, and other non-human entities to make things more complicated.
In India, schools of people seeking mystical and magical development traditionally preach waiting on supernatural powers until after an infrastructure of physical and subtle strengths can be put into place, as with martial arts.
You can see if you read some of the reviews on more popular books at psychic power development that experiments in self hypnosis can go sour, rather like a bad trip on psychotopic drugs. So, in this case, especially, I think it is important to have a cabal to compare notes with. If you do stumble upon a really cool technique and then share it publicly, it could pose a liability, like the compromise of a trade secret or such.
I once heard an Irish stand up comedian say something about wishing to "preserve my slender advantage". There are a lot of YouTube type presentations that might help and pose no real threat to the majority of people. Yet, a priest of Osiris thirty years ago told me that in New Orleans, especially, the astral is a more hazardous place than in most cities, owing to a long history of the abuse of ritual for antisocial ends having polluted the psychic atmosphere. So, not just as an excuse for not having something more exciting to say, I do think I should caution folks that psychic power development should never be undertaken alone, unless one has attracted the jealousy of a really black "mage" (you know, like Voldemort, who actually reinforces the muggle agenda by making magic a treacherous affair) and one has no choice but to try anything, rather than remain a sitting duck.