I've filmed a few weddings.
Definitely get a mic on the priest.
I've always filmed solo. I use two cameras. One sits on a tripod to get the wide angle shot, and I discretely move around to get close ups.
I use a tripod for both cameras, but the one I'm moving I normally collapse and use as a mono pod, only using it as a tripod if I'm going to be in one location for a while.
BRING EXTRA BATTERIES AND MEDIA! Since the wide shot is running continuously, it may run out of memory / tape. Have something to swap out with.
As for batteries, I filmed an outdoor wedding once with no access to any electrical. I brought a portable battery power pack (like the ones you'd take camping) and carried it around in a gym bag. I had my cameras plugged into that most of the time. If you're inside, have bring an extension cord so you can tap into an outlet if need be.
Make sure to get the brides dance with her father. They all love that.
Record the speeches! I know most people don't care about them, editing them will be a drag, and it will add extra length to the video, but the bride will want to hear them. I know this, as I had another videographer film my own wedding and they cut off both the best man's and father of the brides speech. My wife was not happy.
A nice work around for the length of the video with speeches is to make a "directors cut" version. Basically, one version that is extra long with everything that the bride wants, and then one version that is short and peppy that they will actually show to friends family when they come over.
And no, I'm not a pro, so this is just my advice.