Is it worth it? It depends on what you value, what is important to you. Personally, I believe it is more practical to train in meditation first.
Regarding the instructors, none will answer this, because:
This science should never be exhibited, for the White Lodge forbids it. Jinn science is not to be displayed or demonstrated as a spectacle of magic. This science is terribly divine and can be practiced only in secret. When I, the author of this book, wanted to publicly demonstrate jinn science, the Master Morya immediately intervened by saying: “We have been teaching and helping you for the past ten years and now you want to exhibit your powers. Why? Powers are very sacred. Powers must not be exhibited to the pub- lic.” Since then we have understood that the jinn science is very secret. Many people would like to see demonstrations. We, the brothers and sisters of the temple, are not experimental animals of a laboratory.