Reply :- Yes you can start learning it, but under some real Guru or master. According to ancient text, it is the study which goes from one birth to another birth, and it is the reason that some gets quick learning and some are just learning and unable to do any thing. Regular practice refines them and give them success after 8 to 9 years of regular practice. Some students gets is very very quickly, in few months. The reason behind it is the theory of propagation of practice or gained wisdom from birth to next birth.
According to Astrology, if some one is having Rahu or Ketu in strong position, such position indicates that some mystic wisdom like Magic, Tantra, Psychic etc is coming with the native from past birth.