Performing Punyahavachanam Pooja involves the following steps:

1. Preparation: Cleanse yourself by taking a bath and wear clean, traditional attire. Set up a clean and dedicated space for the pooja, preferably with a sacred altar or area.

2. Invocation: Begin by invoking the presence of the deities and seeking their blessings. Light a lamp or candles and offer flowers, fruits, and incense as a mark of reverence.

3. Sankalpa: Make a sankalpa, a sacred resolution, stating the purpose of the Punyahavachanam Pooja and the specific event or object to be purified. This sets the intention and focus of the ceremony.

4. Punyahavachanam Ritual: Recite Vedic mantras and prayers, such as the Purusha Sukta or Pavamana Mantra, while performing specific rituals for purification. This may involve sprinkling holy water (usually sanctified with Tulsi leaves or Darbha grass) or performing rituals with sacred items like turmeric, rice, or cow dung.

5. Homam (optional): In some cases, a small homam or fire ritual may be performed as a part of the Punyahavachanam Pooja. This involves making offerings to the sacred fire while reciting mantras and prayers.

6. Conclusion: Conclude the pooja by offering prayers of gratitude and seeking the blessings of the deities for success, auspiciousness, and the removal of any negative influences. Distribute the blessed prasad to all participants as a sign of divine grace.

It is important to note that the specific rituals and procedures of the Punyahavachanam Pooja may vary based on regional customs and individual preferences. Consulting with a priest or individuals experienced in Vedic rituals will provide more accurate guidance and instructions tailored to your specific cultural and religious traditions.