Professional editing and proofreading services largely agree that printing the manuscript out on paper is significantly superior for catching sneaky typos and repetitive phrasing. When you read on the exact screen you used to water your brain tricks itself into seeing what it meant to type rather than what is actually on the paper. While editing on the paper, use a pencil to point or underline every single word and slow down to prevent skimming that often happens with a glowing monitor. Also, holding physical pages provides a better perspective on the overall flow, pace, and formatting of the work.
