You are able to do this Shabar mantra chanting for eleven, 21, 31, or 41 days, the spot and time of mantra chanting ought to be a similar for the volume of days you wish to do sadhana. You can utilize Rudraksha or Tulsi rosary to chant the mantra. https://vashikaran78764.tinyblogging.com/considerations-to-know-about-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra-76062240