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Excerpts of an article published on The Daily Beast on March 19, 2017, by Barbie Latza
Pope Francis told to a group of priests at a Vatican workshop meant to bolster the skill set of a good confessor, they “should not hesitate” to call on a Vatican-trained exorcist.
Cautioning on the common confusion between mental illness and demon possession, the pope said priests should first consult psychiatrists, but not to rule out exorcism for treatment. “When the confessor becomes aware of genuine spiritual disturbances, he must refer the issue to exorcists.”
“Exorcism is directed at the expulsion of demons or to the liberation from demonic possession through the spiritual authority Jesus entrusted to His Church,” per the Catholic Catechism. “Illness, especially psychological illness is the concern of medical science. Therefore, before an exorcism is performed, it is important to ascertain the presence of the Evil One, and not an illness.”
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Manuel Silveira 
I am from the married priests prelature, renewed universal church-Kenya, one that has been sidelined in Catholic matters. We are not trained in exorcism. Whom do you reach out to?
I am a Catholic layman without authority on the subject. Yet, I would recommend Spiritual Growth to prevent demoniac possession. Note that I finish the article as follows:
If a person has a higher spiritual level, his defense against ghost attacks is stronger as a result of:
His own spiritual strength
Higher protection that he receives from God
Do not seek training and keep close to God to keep demons away.