Take it from me: pitching your book to a prospective agent is (not just "can be" but is) a nerve-wracking process. But guess what? Agents have to pitch books, too -- check out the blog of Superagent Jonathan Lyons to see what he has to say about pitching at the London Book Fair. And then get all jealous reading about him enjoying London.
Now here's hoping he comes back to tell me he's sold foreign rights for Washington Irving. Hey, I can dream, right? (Yes! Come onnnnn, Spanish market! Donde esta casa de paypay...)