Preview (PDF viewer) autosaves my documents

With Preview Quit (not just clicking the red document traffic light), visit System Preferences : General : and select Ask to keep changes when closing documents. This will block autosave in Preview and all other Apple applications that use it. I suggest you undo this when you are done with the large PDF in Preview.

This does place all the responsibility on you to periodically save your work in convenient stages via ⌘-S, and even if you mistakenly quit Preview, a sheet will descend that looks like this:

If you want to discard all changes and quit, you would click Revert Changes, or Save will apply your changes. I recommend convenient stages above, because at 1400+ pages, you do not want Preview to possibly freeze on you and torch your work.

Unless you enjoy alot of extra work, Drexus does not have you on this.

I've got you on this.

• Open PDF in Preview.
• Select all the pages of a given chapter from the left side menu.
• Right click on any one of the selected pages and choose "Export as..."
• Give a name of the new PDF document indicating that specific chapter.
• Once all chapters are broken apart into separate PDF documents, make your edits as you like.
• Once all edits are made, open the first chapter and go to the last page.
• Choose: Edit>Insert>Page from File — and select the PDF of the second chapter.

This should take you a few minutes to break apart, and even less time to rejoin.