The Siddhi [mastery] over this mantra is acquired by standing naked in water and reciting this mantra 1000 times. After this one has to perform Dashansh Havan.This means 1/10th of the total recitations, which are 100 Havans.This Havan is picking up some water in your folded palms and releasing it back into the water while reciting the mantra. This has to be done 100 times. A Havan means an offering which is in this case to the presiding deity of this mantra. All the time while doing this Sadhana [practice] one has to keep in mind the name/names of the enemy/enemies for whom this is being done.
This knowledge should be used with caution and for purposes of protection of the self and family, which is why I am putting all these mantras in the category of Protection Mantras
I do not practice or endorse any of these methods, but I believe no knowledge should remain hidden or secret. So please note that this article is written for educational purposes only.
Om visvaaya naam gandharvalochni naami lousatikarnai tasmai vishwaya swaha ll
ॐ विस्वाय नाम गंधर्वलोचनी नामी लौसतिकरनै तस्मै विश्वाय स्वहा ll