Today's faith healers are modernized. Not all of them are unschooled. Faith healers claims to be guided by Christian deities and spirits. Faith healing comes in different forms. The most simple and common is healing by prayer to get rid of the spirit that possessed the body that made the person sick.
Some healers lay hands upon the body of the sick or use herbal concoction, oils and incantations.
The most hard and controversial is psychic surgery. It is the process of opening up human bodies and extracting tumors or diseases simply by hand. There is no anesthesia but the patient doesn't feel any pain. Success of every performance is very controversial. Poor people always depend on faith healers.