To perform Kala Sarpa Dosha Nivarana:

1. Consult with an experienced astrologer to determine the presence and severity of Kala Sarpa Dosha in your birth chart.
2. Identify an auspicious day and time to perform the remedial measures, preferably during a favorable planetary alignment.
3. Begin the remedial ritual by purifying yourself through a bath or cleansing ritual.
4. Set up a sacred space for the ritual, preferably in a quiet and peaceful area of your home or a place of worship.
5. Gather the necessary items, including idols or pictures of deities associated with Rahu and Ketu (such as Lord Ganesha and Lord Shiva), flowers, incense, fruits, and other offerings.
6. Light a lamp or candle to invoke divine blessings and create a sacred atmosphere.
7. Offer prayers and invoke the presence of Lord Ganesha, seeking his blessings for the removal of obstacles and smooth execution of the remedial measures.
8. Perform specific rituals and mantras as advised by the astrologer to propitiate Rahu and Ketu and mitigate the effects of Kala Sarpa Dosha.
9. Chant Rahu and Ketu mantras, such as the Rahu Gayatri mantra or Ketu Beej mantra, with devotion and focus, seeking their blessings and protection.
10. Offer flowers, fruits, and other symbolic offerings to the deities, expressing gratitude and seeking their divine intervention.
11. Recite prayers or hymns dedicated to Lord Shiva, as he is believed to be the ultimate remover of all obstacles and the bestower of blessings.
12. Seek forgiveness for any past wrongdoings or karmic imbalances that may be contributing to the Dosha, and resolve to lead a righteous and virtuous life.
13. Conclude the ritual by offering prayers for the well-being and protection of yourself and your loved ones.
14. Regularly perform recommended practices, such as chanting the prescribed mantras or performing specific rituals, as advised by the astrologer to continue mitigating the effects of Kala Sarpa Dosha.

Note: It is essential to consult with a qualified astrologer or Vedic scholar to accurately assess and provide appropriate remedies for Kala Sarpa Dosha, as the rituals and mantras may vary based on individual horoscopes and astrological interpretations.