Most sailing ships take what they call trainees who pay to be part of the crew. The Picton Castle takes people who are absolutely raw recruits. But you can't just ride along. You're learning to steer the ship navigation you're pulling lines keeping a lookout in the galley you're cooking.
I didn't go to film school so my learning was done out in public and showed up on the screen.
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But the mechanics of learning to 'throw your voice' are pretty simple. Anyone with a tongue an upper palate teeth and a normal speaking voice can learn ventriloquism.