You may have finalized the guest list, but that doesn’t mean your wedding work is done. (But you’re so close!) Sending the invitations sounds like a hassle-free to-do (off to the calligraphern they go!), but now's not the time to slack-off. To make sure those formal invitations are addressed properly, we turned to Anna Post, author of Emily Post's Etiquette, 18th edition ($40, amazon.com) for her expert advice. Consult this trusty guide before putting anything in writing.All calligraphy done by Laura Hooper Calligraphy.