By New York City Correspondent Sasha Smith And so it begins. I had my first Diploma Unit 3 wine class last week, and I’m already feeling overwhelmed. The Good News: I’m not the only person who isn’t in the wine business. I was a little worried that the class would be wall-to-wall sommeliers and importers, but there’s a small contingent of civilians like me. From a purely selfish perspective that’s good news as it makes me feel less self-conscious, but I think it will be goodfor the class, too. In my experience from previous courses, WSET students tend to overlook…