I was really nervous before my interview, but it was much smoother than I thought. I know this sounds lame, but really own why you're interested in Global Activities and having a global field placement. They're just looking for passionate people who know what they're talking about, have a specific angle they want to study, and who have had some sort of experience with global studies (albeit living in a foreign country, study abroad, or have taken classes about immigration/the globe). Just be confident! Good luck!