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When an actor has had enough training to feel confident in his/her abilities, then it is time. It may take awhile, but an actor should always continue training, showcasing, and pursuing work (plays, student films, indy films, etc) while waiting. The industry always gravitates towards talent, so if an actor is talented, and is showing his work, then agents will find him.
My religious background helps me as a person which in turn helps me as an actor, especially with the whole business side of the biz. Actors have to handle a great deal of rejection and criticism and my faith helps give me a sense of security and a good grasp of who I am and what is important in life. This may sound cliché, but I really don’t sweat the small stuff when I’m looking at the bigger picture of what life is about and what really matters.