Now we know what to avoid when talking to a VC. But what do you say when you have already been flagged as an amateur? How do you convince them otherwise?
Succeed. As long as things are going well whether or not you are an amateur is irrelevant.
For example, Mark Zuckerberg and Andrew Mason would have been called amateurs if their business didn't take off like a rocket and never look back. Kevin Rose was considered a rockstar for a while and when Digg started to decline everyone changed their minds about him.