Exorcism
In Catholic Christianity, exorcisms are performed in the name of Jesus Christ. A distinction is made between a formal exorcism, which can only be conducted by a priest during a baptism or with the permission of a bishop, and "prayers of deliverance" which can be said by anyone.
The Catholic rite for a formal exorcism, called a "Major Exorcism", is given in Section 11 of the Rituale Romanum. The Ritual lists guidelines for conducting an exorcism, and for determining when a formal exorcism is required. Priests are instructed to carefully determine that the nature of the affliction is not actually a psychological or physical illness before proceeding.
Vince Lampert
Father Vince Lampert received his exorcism classroom training at the Pontifical North American College in Rome,Italy. He was in the same training class with Father Gary Thomas, the exorcist for San Jose, California US. Matt Baglio wrote the book, "The Rite: The Making of a Modern Exorcist" based on Father Gary Thomas, that later became the 2011 movie, The Rite. Father Lampert received practical experience, by assisting on over 40 exorcisms with Father Carmine de Filippis, who is the mentor for exorcists in the Diocese of Rome. While speaking to students about exorcism at Seton Hall University about his training, he told them he spent three months training to be an exorcist.