Performing Vastu Shanti Pooja involves the following steps:

1. Preparation: Cleanse yourself by taking a bath and wear clean, traditional attire. Clean the house or building thoroughly. Set up a clean and dedicated space for the pooja, preferably in the northeast corner.

2. Ganesh Puja: Begin by invoking Lord Ganesh, the remover of obstacles, by offering prayers and chanting Ganesh mantras. Seek his blessings for the successful completion of the Vastu Shanti Pooja.

3. Kalash Sthapana: Set up a Kalash, filled with water, adorned with turmeric, vermilion, flowers, and coconut, near the main entrance or in the center of the house. Establish a deity or picture of Vastu Purusha beside it.

4. Mantra Chanting: Recite Vastu Shanti mantras, including Vastu Purusha Mantra and other relevant mantras, to invoke positive energies and seek blessings for a harmonious dwelling. Chant with devotion and focus.

5. Vastu Puja: Offer prayers and perform rituals, such as circumambulating the house or building, sprinkling holy water, and offering flowers, incense, and sweets. Seek the blessings of Vastu Purusha for a balanced and auspicious environment.

6. Homam (Optional): In some cases, a Vastu homam or fire ceremony may be performed, where sacred offerings are made into the fire along with chanting of Vedic mantras. This is done to purify the space and remove any negative energies.

7. Prayers and Aarti: Offer prayers to deities associated with Vastu and seek their blessings for the well-being and prosperity of the occupants. Perform aarti by waving a lit camphor or ghee lamp to conclude the pooja.

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