You're going head-to-head, face-to-face and toe-to-toe in order to have a heart-to-heart with the devil. (Well maybe he doesn't have a heart, but you get the idea). There has got to be some stress involved in this—don't kid yourself. This job will exhaust you physically as well as mentally, and you can bet it will tax you emotionally and spiritually. Demons calling out your weaknesses, your foibles, and your past indiscretions will challenge your body and your mind, and force you to confront things about yourself and the world for which you may be unprepared.
Word of advice: Get ready for it and don't go in unaware or you may not come out the same person you were.