Saddlebag, I think its different for different horses. My pony is what I'd call *well schooled* but liberty work makes her nervous. I think the lack of micromanaging on my part gives her confidence issues, she gets confused about what is being asked of her. Because of this it is not something we have focused on in the past.
(PS: We are working on it... She turns, backs, lowers her head and stops at liberty, I am teaching a walk forward cue. Maybe she will soon improve.)