Josh,
For the exposure, there's a technique called "bracketing" you can try. What you do is take 3 shots, one at 1/2 or 1 stop below your guesstimated exposure, one at that value, and one at 1/2 or 1 stop above. So if you think you need to shoot at f5.6, you shoot one at f4.5, (or f5) one at...