Use of examples, quick visual aides. Study guide somewhat helpful. Narrator using lecture style mostly. Structure in parts to allow viewing and then discussion. I would say not more than two or three one hour session in group.
Leader needs a good understanding of worship service.
The components within it. The movements and meanings through a worship service and maybe some history of worship. As for showing the tape, a good presenter who can prompt viewers to discuss points. Narrator a bit monotones. Should prompt discussion by viewers.