Assuming this is a serious post from a human being honestly wanting advice(and I have my doubts by the way it's posted) then I'd say...
I say scrap the book, and not worry about it. Listen to the original version, sing, record yourself. Listen closely how you sound, and how you sound in comparison. Practice over and over again until you get it as close as to your liking.
As much as I respect the spirit of attempting to perform as song on absolutely perfect key as intended, I hardly doubt a group of wedding goers will be too concerned to be picky critics if they'd have the ear to be anyway. Unless you're really awful and really off, I don't honestly think the audience you're catering to will mind.
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