You don't have to be a mixologist to create delicious classic cocktails that your guests will love. From the iconic martini to the the effervescent mojito, only a few drinks have stood the test of time to be considered classics. With a bit of practice and some expert advice, anyone can master these staple libations, says Dale DeGroff, author of "The Craft of the Cocktail: Everything You Need to Know to Be a Master Bartender."