Clipless and learning mountain biking

[Irulan]

hmmmm, I've been doing it wrong then. I have one pedal up and one down, and a leg leaning against the bike. I have not tried to pedal when standing on the pedals yet...

This is not intended as a slam, but it's classic roadie-to-mtb behavior.

You will get so much out of the clinic...

Legs in contract with bike frame will give you lots of nice bruises, and makes for instability.
Notice in my little write up I specifically say, "don't hover"? The next classic beginner mistake is to get pedals levels, then hover above the seat, with the knees gripping or rather close to the frame or saddle.
One of the most primary skills in mountain biking, which the neutral position points you to, is body-bike-separation: getting your body to move independently of the bike.

Been discussed here before:
http://forums.teamestrogen.com/showt...hlight=youtube