Would not call it a waste of time. Simply misguided.
''There is a beast in man that must be exercised, not exorcised.''
As Anton LaVey put it.
THe idea of ''werewolves'' these days is similar, and related to psychic vampirism, and the two overlap quite a bit. And yes, I am referring to shape shifting on the astral plane.
So, yes, it is possible to astral project, become a wolf-like monster, losing control, etc. The full moon has a weird effect on humans in general.
So it's much more complex than just saying a bunch of magic words and turning into a monster.
The prerequisites include astral projection, psychic vampirism(not 100% about this one), strong visualization skills.
The guidance of a spirit in these matters is more than advised. Qlipphotic spirits from the spheres of Lilith and Gamael, like Lilith herself, Naamah, and others are good, but a variety of other entities can help, like Marinette des Pieds Seches.