Think of rough drafts as placeholders. Keep writing, keep writing badly and just keep the faith that in place of that clunky phrase or inexact word, you are eventually going to put in jewels. Beautiful and precious stones which you'll find on your walks or in your sleep or glittering on the floor of the shower.
Problem is, as you keep trudging along, pretty soon those little stones start poking the heel in your boots while you're walking to meet your husband for date night and you brought no pen. And fly up from your bike wheel and hit you in the chest. And drop on your face at dawn when you're trying to stay asleep for a badly needed couple more hours.