This is a procedure meant for very special and specific motive to be fulfilled onto the material Grounds of reality. Goddess Durga in the form of Chandi or Mahakali is worshipped night after night with prolong intense mantras and verses to appease her and grant benedictions. Bagulamukhi is the goddess and expression of infinite energy coming into mystical manifestation through this ceremony or kriya ritual. That benedicts person devoted to her with incredible boon. It's an invincible energy that is beyond thought and word description.
Worth only if motive is pure and untouched with evil intentions. Because it leads to pure power and authority.