Be sure you read it through critically, comparing sections and checking overall flow and logic, just as its eventual reader will. This kind of checking may make you want to restructure your essay completely. You can combine versions easily too. Then you can copy from one to another. To go quickly to a specific passage in your draft, use the Search function of any word processor.
Documentation is less trouble to do well.
Parenthetical citations are easy to check and complete. There are ways also to create a Bibliography or Index as you go. Do use a spell checker as a final touch to your editing. They catch not only spelling errors but also typos. Keep in mind, though, that the computer won't tell you that you've mistyped form for from , much less that you've misused principle for principal .