I found this recipe on allrecipes, and followed it for the most part:
http://allrecipes.com/recipe/miriams-not-so-secret-challah/detail.aspx
A word to the wise: this takes a LONG TIME. Three hours according to my source, longer for me in practice. That whole waiting for it to rise part is annoying, and if you get impatient and hungry like me you should start an hour earlier than you think is necessary.