The cooling-off period: why you need distance
The most important thing you can do before self-editing is nothing. Finish the draft, close the document, and do not open it for at least two weeks. Four to six weeks is better. During that time, your brain stops maintaining the mental model of what the manuscript says and starts reading what is actually on the page. Authors who skip the cooling-off period miss the most obvious problems in their manuscripts, because they are still reading the version in their heads, not the version in the file.