For me the "Aha!" moment came while being part of the interviewer side of the coin and asking a simple question like "what was a project you worked on". This particular person described an html page with a dropdown as quite the challenge. At that point I realized I actually knew a great many things.
After years of freelancing I've joined a company full-time and now realised how many things I've picked up along the way. Its reassuring.
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