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So basically, if you witness something you become an expert on it. I've watched lots of movies. Does that mean I can be a director?

A logical person would see that in order to work on a component of a system, the entire entity should be understood. Take for example a veterinarian. You couldn't just bathe a dog, and not know how...

Nadca was a good idea for someone to make money. Yes they have their guidelines, which are good for someone who doesn't know about hvac. But have you seen their membership fees? They are...