You must stop editing--or you'll never finish anything. Begin with a time-management decision that indicates when the editing is to be finished: the deadline from which you construct your revisionary agenda. Ask yourself, 'How much editing time is this project worth?' Then allow yourself that time. If it's a 1,000-word newspaper article, it's worth editing for an hour or two. Allow yourself no more. Do all the editing you want, but decide that the article will go out at the end of the allotted time, in the form it then possesses.