This may not be exactly what you are looking for, but I have done some riding with the Luna Chix group and they are extremely beginner friendly and will actually stop and teach you things. Worlds away from the NEMBA lesson I took (the guy was nice enough, but he was 6'+ and 200+ lbs so his suggestions for skill-based stuff were not necessarily relevant to smaller body types i.e. "you should never be in the smallest chainring at the Fells")
(this is NOT a slight against NEMBA, just a plug for women-specific learning!)