If they are self-taught, a good teacher with lots of experience is not ashamed to admit they are. Claims of profound mystical powers are often a warning sign, as is how your prospective teacher handles proprietary information. If the style of language used in the text does not match what your teacher or fellow group member usually uses, chances are they copied this information elsewhere without crediting its author. A good teacher will not only credit where they acquired information, they will make a point of teaching you to do the same. Don t adopt a teacher on the basis of one meeting.
Spiritual education is a life-long journey.
There s no inherent value in rushing your decision. This should be a two-way process and a teacher who does not take the time to evaluate prospective students is in search of quantity, not quality. Sometimes the only way to get to know a teacher is by enrolling in a class they may offer online or at your local occult shop. Conduct a background check. A reputable teacher will be happy to provide references.