A very close friend asked me to photograph his wedding as the only photographer. I said, "No, I will not be your wedding photographer."
A month or two later, his fiance asked me if I would do it. I again said, "No", quite firmly. I said I did not want the responsibility, and had no interest in being a wedding photographer.
Well, the wedding day comes, and guess what? They had no photographer. Big wedding. 200+ guests. No photographer had been hired. They knew I would have a camera with me, so they just planned on me doing it even though I had said "no".
Well, I told them that I would take some pictures, but would not be responsible for anything. In other words, don't expect much of anything, and don't keep asking me to shoot various groupings of people in posed positions - you know, the "let's do the bride with her parents now", and "Ok, now we want all of the groom's family in a shot". I would not shoot any of that crap. I did agree to shoot anything I felt like shooting, but made it clear that they were not to direct me as to what images they wanted to be shot.
The whole thing was difficult because I was the best man, and therefore had no way of shooting the ceremony itself. They didn't care about that.
So, What I basically did was to shoot a bunch of candids at the reception. Funny stuff like waiting 'till somebody would pick at their nose and then take the pic at that moment. Or I would wait 'till somebody would burst out laughing and take a shot of them with their mouth wide open in contorted laughter. I just did what I wanted, and shot what I felt like shooting. And it took me about 3 months to get the photos to them (burnt onto a CD).
Surprisingly, they were thrilled! They really enjoyed the pics. A couple bitty old ladies - aunts or something - shot the ceremony from the front pew with their little point and shoot cameras, so they already had those types of static, formal shots.
So, I guess the advice I have, based on my experience, is to be firm and insist on doing only what you feel like doing. Don't go trying to be a good Samaritan unless it's what you feel like doing. But be sure to put your camera in the car when you drive to the wedding, just in case.
"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".