Pick the very spot which will be relaxed and secluded so that you are not interrupted by any unnecessary sounds. ऊँ ऐं हीं श्रीं हीं हूं हैं ऊँ नमो भगवते महाबल पराक्रमाय  Other than, it should be understood that working with these mantras very carefully under steering of expert is https://www.youtube.com/@Mahavidyabaglamukhi