I'm preparing my fourth Blurb book currently. The last two were 100-plus pages epics.
I take no heroic measures other than ensuring that the images look okay in sRGB on my screen. It so, the images will print fine. I do normally ensure that there are no large areas of dark shadows. Occasionally, my attempts at pre-print contrast reduction go too far and are visible on the page. I'm a fairly critical viewer, with lots of experience with my own large format printers.
I use the "large landscape" format, the highest quality lustre media and the "hard bound with dust cover" production criteria. Within reasonable limits, it's WYSIWYG.
While we all want the best possible reproduction of our work, I think it's useful to remember that Blurb et al are not part of a fine art reproduction workflow. Their process is aimed at high-level consumers. Each time I've opened a new book, my reaction has been the same: delight. All the the failures I've seen in my books so far have been mine.
That said, designing, writing and photographing your own coffee table book is an extremely satisfying outlet for creatives. It tests every aspect of your skill-set.