One of the things that saves a bit of time is automatically applying master pages to the generated FrameMaker documents.
To do this, I set up the following table on the MasterPageMaps reference page of my DITA-FMx-Book template file:

The last line, beginning with E:title, instructs FrameMaker to test the value of the outputclass attribute on the title element of a DITA topic file and assign the NonChapterPage1 master page if the attribute value is "NonChapterName".
I assign the master pages by either:
- Selecting the chapter files in the Book window and choosing Format > Page Layout > Assign Master Pages
- Selecting the Apply Master Pages checkbox on the Update window when I first regenerate the table of contents for my book.