Winding Road - I know some of the instructors and they are quite good and very supportive. I think this would be the safest/best way of getting back on the mountain bike. It is totally focused on women - and ya know - sometimes we learn in different ways than men, and sometimes not. All of the instructors are certified, and they just had their own clinic as a refresher.
This is why I am going to the clinic, I figure it is the safest way for me to learn the very basic skills I need and they will be there to help me learn them in the safest possible way. Sure I am nervous about it, but it will be fun!
Go for it - and we can all be scared together