1) Word-search edit Act 4, spell and grammar check, copy and paste it into the larger document.
2) Make some small changes I know I need to make-- mostly changing names, or adding a few lines here and there, or deleting one entire small story thread that I inserted thinking i'd need for the climax but then I didn't.
3) Print document and read it. --sent to printer
4) Fix any issues I see: consistency, timeline, chapters that end in the wrong place, plot holes, etc.