I'd have to say that I'd not accept that request Becca. I'm with you on that one. This is a huge "forever" deal and I can't tell you how many times I've heard couples say, "Oh, I so wish we'd gone with a professional photographer..."
Keith is giving the very best advice, eh? He's been there and totally understands the stress of getting things right.
I'm not an accomplished photographer, so for me to say no to such a request is only self preservation!
Casting no aspersions on your beautiful photography skills mind!