Every Sadhana starts from an objective or say many objectives (when there are so many desires). Shri Vidya Sadhana is said to be one of the most powerful sadhana that is supposed to give both matter and enlightenment together; that’s why people are mad about it.
You can learn this sadhana from the book (if you find any good book, kindly do tell me also), maybe, get to know some rituals and 15 digits mantra (Panchadashakshari) of it along with most popular Shri Yantra (it is geometrical shaped two dimensional or three dimensional figure, used in Shri Vidya Sadhana). But, what I learned in Shivyog ™ ‘s Shri Vidya Sadhana were more than that (and I doubt, if it could ever be possible in any book).
The first secret is: you get awakened (Jagrat in Hindi) mantra of Shri Vidya that is called Panchadashakshari. The power of awakened mantra is – it starts creating instant effects, you can realize through vibrations in your body. You can’t get this awakened mantra from any book.
The secret two is: you get “Sanjivini Shakti” which works with mantra, it is an energy (gifted by Avadhoota Baba Shivanada Ji of Shivyog™), and it comes when a person invokes it. And, this energy is supposed to help in Sadhana.
Both the “awakened mantra,” and “Sanjivini Shakti” are not available in the books, for further information regarding Shri Vidya Sadhana, you can contact to official website of shivyog (shivyog.com).