Jayapataka Swami: If possible, then guru can chant prayer on the Nrsimha kavaca and bless it and that way empower it. So better to get permission from the guru and get him to chant on the Nrsimha kavaca. But if the guru is not present, you can get another senior devotee to do this.
04-FEBRUARY-2020 SRI MAYAPUR DHAM, INDIA