In addendum to #2 about small talk. I think you can gauge quite early on if they're a client who enjoys small talk. I'm not a big fan of small talk, but it's pleasant to get your clients onto a personal level. However! You have to be really careful not to get too personal with your clients as I just don't think it works. There's a sweet spot between getting close and keeping your distance that's perfect for business acquaintances.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.