I should have asked how big the book will be, how many pages and what dimension, but I don't really think it matters. I always keep in mind that 1/4" on the gutter side of my pages through the book and it has always worked perfectly. On thicker books, farther into the book where there is more tension on the paper, 1/4" is barely enough, but nothing has ever been cut off.
I would hate to give you bad info---but the preview is really true to what you'll get. If it looks centered on the preview, you'll be okay.
Hope it works!
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Sarah 
Equipment: Canon T2i (550D) with 18-55mm f/3.5-5.6, 55-250mm f/4-5.6, 50mm f/1.8, and 400mm f/5.6L lenses
Software: Windows 7, PSE 10 (Editor), PSE 6 (Organizer), and PSCS 4
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