easier said then done, Joint parametes can act strange at times, But not impossible. Keyframeing is tedius work but with custom models and clothes like the one your talking about would need to be animated by key frame by frame when your doing a swirl around with the dress. Walking should be easy just make a walk path, I think motions would be good too if they were easy to make and cheapo to do, But they require sensors and stuff that must be worn on the body to record the movements.