Start with the words you expect to keep
Formatting gives a manuscript its reading structure: headings, page rhythm, image placement and typography. Editing works on the content itself. If chapters still need to move or sections need substantial rewriting, resolve those decisions before investing in final page layout.
Know which kind of editing you need
A structural edit considers the organisation and development of the book. Sentence-level editing improves expression and flow. Copyediting addresses consistency and language details, while proofreading looks for remaining errors. Projects vary, so ask what the proposed service includes instead of relying on its name alone.
A simple decision rule
If you are still asking “Does this chapter belong here?”, focus on content. If the text is settled and you are asking “How should this page read?”, you are closer to design. A manuscript can be visually attractive while still needing editorial work; a polished draft can still need thoughtful typesetting.
Allow a final review after design
Some issues become apparent only when words sit on finished pages. Plan a review of the laid-out book, and check an appropriate preview or proof before release. Small corrections may be expected, but extensive rewriting after layout can create extra work.
What to send your designer
Provide the latest approved manuscript, confirmed chapter order, images and captions, and a list of required formats. Identify anything that must remain exactly as supplied. If editing is still underway, say so early and agree on a suitable sequence.