You have a vision of the work you want to write. You’ve laid out a plan for a textbook or monograph (or article). You might have a book contract, or you may be doing the work prospectively. The writing is done. You breath a sigh. But how about the editing?
Many writers and academics feel comfortable with the content creation, that is the writing. But they may feel less qualified with that pesky editing. Split infinitives, that or which, ending a sentence in a preposition, and a thousand other archine rules haunt some writers and sap their confidence about their work.