To perform Lakshmi Puja on Diwali, start by cleaning and decorating your home with diyas and flowers. Place Goddess Lakshmi and Lord Ganesha idols on a red cloth. Set up a kalash with water, rice, and a coconut. Offer sweets, fruits, flower, and light 5 diyas. Chant prayers, perform aarti, and end with sharing prasad for blessings.