Especially if you have no Exchange experience

This is a project that's going to fall in my lap shortly, and it doesn't look like I'll be able to pass it off. I'm going to push it back as far as I can, but I doubt I'll be able to get more than 2-3 weeks.
I've found some guides via Google and things like that. I was just curious if anyone had any additional pointers.
TIA
Oh, and if anyone wants to remain on-call the day of the migration, you'd be more than welcome