Working with flash or available light? f/4 with available light and trying to keep the shutter speed up is not an easy feat.
Both. Of course, I was closer to what I understand to be your age when I did most of this

Usually using Vericololor II or III @ an EI of 160.
Some on a tripod, but just as many handheld with a short neckstrap and the left hand trigger grip.
Weddings are great crucibles of technique!
