I do this a lot. A couple things I've realized: - Quite a few of the people you meet aren't going to lead to much. A few of them will lead to something but not until further down the road. Basically, not everyone is looking for freelance developers.

- You have to know a bit about sales. If I'm talking to someone non-technical looking for an online store, I'm an expert in e-commerce, but if I was talking to someone in the industry, I'm less likely to throw out the term expert and more likely to try and talk about specifics.

- This is culture dependent but in the States, I've found being too modest is a negative and people seem to interpret it as either disinterest, lack of confidence, or lack of skills.

- I once overheard a discussion that went something like this, "I'm looking for a developer." "If you can get <that person> that would be great." I'm not there yet but I want to be <that person>.