I've been having an extended conversation via PM with controversial new poster Gig3000, and while I think she herself realizes she didn't give an ideal first impression, she does have some real and important questions that deserve answers. For all us committed urbanists, I think we need to make an extra effort to be supportive of anyone who is contemplating leaving the suburbs for the city, at whatever age, and for whatever reasons.
One of Gig's main questions is what expectations should someone who has never lived in a city before have about making the move, and what advice should they be given.
Since I've never lived in a non-urban area, I don't necessarily have a whole lot to contribute. I've given the general advice of keeping an open mind, being flexible, and also being smart and aware about your surroundings, and which parts of the neighborhood are safe and which are not. But maybe some people on here have made the transition from suburbs to city life and have more to offer.