अश्वत्थामा बलिर्व्यासो हनुमांश्च विभीषण:। The whole ritual must be done at night. Yantras energized in the course of the evenings of Maha Shivratri, Holi and Diwali are handiest and powerful. Just before donning a Yantra, foremost it should be drawn using the eight Kaula perfumes and The main element mantra https://www.youtube.com/@Mahavidyabaglamukhi