To add to the excellent advice already given...
I like to mic all different speakers. For example, if you use a C90 and V30 in the same cab
make sure they get both mic'd. This way when mixing, you can tweak accordingly.
When they "have you" make sure you take a listen to what they have, via the PA or monitors.
When we recorded last fall, I was coming in too "buzzy" so I had to back down on the gain.
Cycle through each setting you plan to use, ie clean, semi-dirty, dirty, etc. to make sure
they have everything you expect. Careful not to spend all day on this though, unless you
have all day and unlimited resources, you might just need to "get it there" and refine later.
Most of all have fun, it'll be hurry-up-and-wait for the first hour or two until ever thing
gets dialed in so try not to drink too many beers...hehe.