That is good that you'll have three cameras. I was the only one so it was hard for me. I found a great place to film from during rehersal, behind and to the right of the pastor. I was able to use the tri-pod, got good shots of the bride and groom, maids of honor and best men and even the pastor.
The only problem was when one of the brides maids (the brides sister) sang a song. She was facing the crowd so even after moving around to the side I wasn't able to get as good a shot of her as I wanted. And then of course getting to the front doors to film the bride and groom as they were "pronounced" and coming down the isle.
This church had a balcony and I could have filmed from there but I really didn't want to be limited to back shots. I think the bride and groom really liked that I got them from the front.
It was good experience for me and gave me plenty of ideas for any future filming I may do. This was family and they pretty much told me I could anything I wanted so I wasn't under pressure. That helped a lot!
Good luck and congrats on the upcoming marriage! I hope God blesses you with a wonderful married life!
Debby