Describing about the rituals connected with the worship of lord Vishnu, lord Mahadeva told Parvati– A devotee can worship Lord Vishnu by making his idol. This mode of worship is known as ‘Sthapita’ (installation of an idol). There are also some sacred places related with lord Vishnu which are called ‘Swayam-Vyakata’ (self manifested) like Indradyumna Sarovar, (Kurma sthan), Kashi, Prayag, Dwarka, Naimisharanya, Mathura etc. In all these holy places, Lord Vishnu had manifested himself. A devotee should get up early in the morning and perform ‘achaman’. He should then chant the holy name of Lord Vishnu. He should take his bath and sit down to worship Lord Vishnu.
A devotee should install idols of Lakshmi-Narayana on a beautiful pedestal and adorn it with flowers. He should then make offerings of various articles like akshat, fruits, flowers, etc. to the deity. While worshipping, it is most necessary that a devotee followes the rituals as mentioned in the ancient scriptures like Shruti, Smriti, Vedas etc. He should chant the shlokas of Purusha-Sukta as well as the cryptic mantra for the accomplishment of ‘Shodashopachar’. He should light a ghee lamp and make offerings of articles like camphor and betel leaves to Lord Vishnu. While making offerings in the sacrificial-fire, chanting of a shloka either from Purushasukta or Srisukta is mandatory.
There are some specific days which are considered to be specially auspicious for the worship of lord Vishnu–Amavasya, Saturday, solar eclipse, lunar eclipse etc