To protect ourselves from Kali we have to be honest, sincere and should not keep ulterior motive-. Hence we became instruments of Maya. We should strive to live by the teachings that Srimad Bhagvatam has left with us.
There is a certain power of protection in receiving blessings from good people. Those blessings have a special potency as they are coming from spiritually evolved people.
The real protection you can have is to surround yourself with Sabda Brahman (transcendental knowledge).
In the commercial airlines, at takeoff the flight attendants instruct passengers in the use of oxygen masks, reminding them to secure their own masks before assisting others. In the same way, to be effective spiritual warriors we must protect ourselves first. Otherwise we are of no use to anyone. The greatest protection of all comes from our unconditional, unmotivated, uninterrupted devotional service. Such service opens us up to a flow of divine love and protection in all circumstances.
Reference: Spiritual Warrior III: Solace for the Heart in Difficult Times, Chapter 8 – How To Strengthen Ourselves
One who learns to take shelter of Krishna can be peaceful & protected in any situation.
Maharaj Ambarish [when faced with fiery demon] didn't move. He took shelter of Lord in surrender. That surrender attracts the Lord to protect us.