Wow, people need to show some decorum around here.
Most recently I attended the rehearsal for my cousin’s wedding. It was in a chapel on the grounds of the banquet facility. I took some stills during the walk-through, using the SLR viewfinder to simulate the video camera, to check the angles. I negotiated with the JP to affix a wireless mic to his robe – thus he had some buy-in.
In the actual main event, I agreed with the stills guy to stay out of his shots, and we each chose a side of the aisle for the procession. I was hand held for this, and had sticks setup in the back of the house. At a convenient point once everyone was in position, I dashed down the outside aisle and went to the tripod for the remainder. I also had a small HF200 up high on a light stand in the opposite back corner for a safety wide shot, allowing me to change position with the main cam if need be.
As others have stated, get some agreement from whomever is in charge as to where you will be and when. Make sure the back of your head does not get in the stills shooter’s pictures.
And when it comes to the reception, make sure you always know where the cake is located relative to your posterior whilst moving in the opposite of forwards!
Mike Cohen