You can do this Shabar mantra chanting for eleven, 21, 31, or 41 days, the area and time of mantra chanting should be precisely the same for the number of days you would like to do sadhana. You may use Rudraksha or Tulsi rosary to chant the mantra. It's https://garrettirrlg.wizzardsblog.com/32310219/top-latest-five-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra-urban-news