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There's a small percentage of people who can act. There's a small percentage who get to do this for a living. There's a swath of the population that are able to keep a story in their head and fight all the battles against self-consciousness and the surreal unnaturalness of acting in a movie. The technical aspects you can learn fairly quickly.

"Tom Hanks Talks Captain Phillips, Meeting the Real Title Character, Filming on a Lifeboat, Shooting the Movie’s Final Scene and Working with the U.S. Navy". Interview with Christina Radish, collider.com. October 8, 2013.
There's a small percentage of people who can act. There's a small percentage who get to do this for a living. There's a swath of the population that are able to keep a story in their head and fight all the battles