1. After meals : Don't do the puja after you have had your meals. Do it after you have a bath first thing in the morning.
2. Blue dress: Do not do puja wearing a blue dress or offer one to the Lord.
3. Borrowed flowers: Don't do the puja with borrowed flowers, leaves and fruits. Buy some fresh flowers yourself.
4. Burning incense : Don't use incense sticks (dhoop) without ghee (clarified butter) while doing the pooja.
5. Chewing masala: Don't chew pan masala or eat tobacco while doing the puja.
6. Contracted through nails: Do not offer the lord any item that has contacted the nails or contacted water falling through nails .
7. Covered in head to toe: Do not do the puja while covering all your body parts - keep your hands free for aarti.
8. Don't use thread: Don't use thread to make diyas for puja. Use cotton balls instead.
9. Idol in left hand: Don't bathe the lord while holding his idol in the left hand.
10. Nakta Vrata: Do not do the puja if you have not observed nakta vrata on ashtami.
11. Offering items: Don't offer old or used items to the Lord. Always use new items.
12. Shiva puja: Do not do the puja while hating Lord Shiva during the process. It will cast a bad omen on the puja.
13. Sitting on high pedestal : Do not sit on a high pedestal while offering dhoop to the Lord.
14. Someone else: Do not worship Vishnu as someone else or someone else as Vishnu.
15. Tatavdevatas: Do not do the puja without doing pooja of the tatavdevatas proceeding to vishnu pooja.
16. Unwashed feet: Do not enter any temple (whether at home or outside) without washing your feet and legs.
17. Use only ghee to make prasad: Use only ghee to make the prasad of the pooja and nothing else. (like vegetable oil)
18. Using the washroom: Do not do the puja after using the washroom and do not use the washroom during the puja.
19. Vighneshwara: Do not do the puja without worshipping Vighneshwara and Kaapali.
20. What not to do? : We all know that Vishnu Puja helps us in maintaining the health and peace of the house. However, here are a few things you should never do while doing this puja.
21. Worshiping in darkness: Do not worship the Lord in darkness or touch his idols.
