I kind of do a mix of Al Gordon's method of lighting in the church and how I light sports team photos.
Pick your preferred aperture for the formals and set up a flash behind you, pick your ISO and set you flash (I usually go for around 5.6 but have shot as open as F4) I use a 300ws monolight and 2x2 softbox.
I then take an ambient reading at the subjects position using the ISO and Aperture from the flash setting.
With an IS lens I don't bother with a tripod unless the shutter speed gets below 1/20 to 1/30th range.
I find I have more issued with shadows when I use an umbrella, and a speedlight is too weak if it's anything but direct.
So this was shot at 1/20, (handheld 17-55 IS lens) at F 5.6 @ ISO 400
Here is another - the back wall was SHINY wood and I found no solution to avoid it in the time alotted. Here I was a bit too slow/unsteady handheld -the subjects are fine, but the BG details have blur.
Note: There are almost no shadows from the candles and such on the wall - I attribute this to dragging the shutter but really have no idea - it just works!
