What Thom said.
My younger brother just got married a couple of weeks ago and he asked my older brother to do the ceremony and me to be the best man. Worked out well; my older brother got his license on line and did a great job, and the wedding had a great, casual feel to it. As the best man, all I had to do was give a short speech (I hate public speaking
) which I pulled off fabulously after a couple of PBR's.
Good Luck and congrats!
Jim