In many ways, this is like the first visit to a doctor, to get a diagnosis, prognosis, and an estimate. It's a crucial step, and the best mode for a consultant is to listen and question. His primary goal at this meeting should be to deeply understand the client's needs. In fact, it's a code of ethics issue for CMCs to act in their client's best interests, and I can't do that if I don't understand your needs. A real possibility of exploitation or disappointment.
Candor is both dangerous and essential.
There is a danger of deliberate or unintentional misrepresentation. There is a tension between moving quickly and building a foundation for a more solid relationship. So this first working meeting does indeed have all the dilemmas of a first date. Both parties are laying the foundation for a relationship as well as managing a single encounter. Until they are all addressed, we won't know what to do, or how, or when.