Well, good question.
I told her that authors see many steps along the way, so it wasn't likely I'd be blindsided by the final stage. That said, bound books always look different - more official, trimmed and spiffy - than mechanicals, proofs, or dummies. I told the student that if things didn't look the way I hoped they would, I would take a deep breath and try to find some things that I did like about the book. The process of making books involves many people, many ideas, many backgrounds, and many personalities. Some books travel a smoother path to publication than others. But it's all about working together, and it's always a thrilling ride.