Hi Anita,
We don't have many years of experience but we're getting there.

From discussions with the client, I'll find out the type and location of the church or facility. If it's Catholic, I'm comfortable that it will be well lit. If it's a small or old country church that I'm not familiar with, I'll either check it out or gather enough information to make a decision. I don't want to worry about lighting issues so I make it clear to the client that the level of their video quality will depend on how well the church and reception are lit. I find that most people are eager to help describe the church and its lighting.

I basically just need adequate lighting around the altar area and I try to get camera 1 as close as possible without being intrusive. Seems that 15' to 20' usually works. Hope that helps.
Bob