You have it all under control. A little here, a little there. An hour here, an hour there. Many, many nightmares in between...
And then it's the last night. Everything goes swimmingly. You put in the hard work needed. You run the numbers. You run them again. You correct here and there and here.
You go to print with shaking fingers.
You haven't bought the right paper. You can't convert the thing to PDF.
But cheerful because, well, shit. The hard part is over.