So finally, after much searching and careful selection, you've chosen an editor to work with.
Perhaps this is a substantive or line editor, who is going to read your manuscript carefully and make notes, corrections and suggestions on every sentence, paragraph and chapter.
Or maybe you've decided to work with a developmental editor, who is going to read your manuscript carefully and help you through some bigger picture issues like character, dialogue, premise and structure.
Perhaps you are at the end of your writing process and need a good copy editor to make sure all of your grammar and spelling is perfect. In any event, there are a few things you can do to help your editor do his or her job more easily.
Get an overall word count.
Put a word count next to each chapter title (this is important for substantive and dev editing)
Double-space your document and use Word.
Choose a font that is easy on the eyeballs like Calibri or Times New Roman.
Use the Styles Pane to make every chapter title a header one or header two.