My answer to Which occult magical tradition is best for self-transformation?
Answer by Alex Sumner:
If by “self-transformation” you mean transforming yourself into a better person spiritually, you should investigate Theurgy-based systems – “Theurgy,” which literally means “god-working,” is the use of magical ritual to attain the ends of mysticism. The Hermetic Qabalah (e.g. the Golden Dawn) is a prime example of western Theurgical occultism though there might be other traditions capable of achieving the same thing.
If, however, by “self-transformation” you mean shapeshifting, you would be better off looking into Shamanism. The shapeshifting involved takes place in a ritual context and is meant to give you spiritual insight, i.e. you would transform into your Power-Animal because to do so gives you magical powers such as healing and wisdom, not because you are doing it for the LOLs. (Actually the Golden Dawn theoretically has magical rituals which supposedly accomplish this kind of transformation as well).