"Best man"

If you can take a speech class next semester (if you haven't already) I'd say that would help a lot. Public speaking is one of those things that gets easier the more you practice it. Plus, a college speech course usually covers how to give a toast at a wedding without making yourself look like a jackass.

Yeah, actually, I have Public Speaking right now this semester! I did an introductory speech to introduce a person, but I've yet to practice on doing a toast.