One of the first decisions you'll make after you get engaged—once you've basked in the moment and taken time to mark the milestone with family and friends, that is—is when to get married. After you establish whether you're going to have a long (think eighteen months or more) or short (six months or so) engagement, you'll have a clearer sense of your wedding roadmap. Once that timeline is set, you'll know exactly what you'll need to accomplish within its bounds, from saving up and booking priority vendors to sending out save-the-dates to your loved ones.