Excellent advice. I dont know where some of these characters get the idea they can just pick up a dusty old book or some long lost sheets of parchment and think they can just read it out and get rid of the demon like a professional! It takes years of training and education to get to the stage where you can charge money for this service.

Bigger hint: If the professional (i.e. priest) tries to do so and runs like hell out of your house, you'd probably do well to follow him.