Viodea, I just found out that I'm also in your situation, so to speak. Iv'e been coerced into shooting the wedding for my Son in law's son from my son in law's previous marriage. ( I think I have this right.) Anyway they say they can't afford a photograher, so the family says I have to do it. I havn't shot a wedding for 20 yrs, and I only did a few then with medium format and a lot of flash. Now I only have one Rebel XT. I DON'T HAVE TWO OF EVERYTHING AS I DID THEN!
Note Tim's advise about the histogram. You do have time to practice this use of the histogram to get your exposures right on. When you crank up the ISO you have to get the exposure spot on, or you will have bad noise. Even if the ISO is not high, getting good exposures can do a lot for your picture quality, or at least ease your PP effort. You must have POWER AND STORAGE. Get a backup battery for your camera. Borrow or steal more CF storage. Shoot RAW. Make sure you have flash power. Do what you know. I will say this for myself. The wedding is not the time to guess or experiment. Get good exposures and framing, with good honest, real expressions on the subjects faces, and you will make a lot of people happy.
