There's no way to put a limit on what one may accomplish individually if the intent is an impeccable intent. Don Juan's teachings are not spiritual. I repeat this because the question has come to the surface over and over. The idea of spirituality doesn't fit with the iron discipline of a warrior. The most important thing for a shaman like don Juan is the idea of pragmatism.
Carlos CastanedaA warrior takes responsibility for his acts, for the most trivial of acts. An average man acts out his thoughts, and never takes responsibility for what he does.
Carlos CastanedaKnowledge for a warrior is something that comes at once, engulfs him, and passes on
Carlos CastanedaNothing in this world is a gift. Whatever must be learned must be learned the hard way.
Carlos CastanedaIt isn't that a warrior learns shamanism as time goes by; rather, what he learns as time goes by is to save energy. This energy will enable him to handle some of the energy fields which are ordinarily inaccessible to him. Shamanism is a state of awareness, the ability to use energy fields that are not employed in perceiving the everyday-life world that we know.
Carlos Castaneda