Not only that, but in Vedic ceremonies you have a priest who is just there so no mistakes are made. >The brahman was the reciter of hymns from the atharvaveda

Not only that, but in Vedic ceremonies you have a priest who is just there so no mistakes are made. >The brahman was the reciter of hymns from the atharvaveda who was largely silent and observes the procedures and uses Atharvaveda mantras to 'heal' it when mistakes have been made.