Join Date: Aug 2009
Location: secret mountain valley
on the leading front, it is hard to say exactly what is going on without being there but I would not stop and back when he wants to. Do not turn toward him, that is releasing the pressure, and don't keep a strong steady pull on the rope as he'll just lean more and more against that. Instead, try short repeated tugs to get those feet moving again and then release the second he starts moving forward. You can swing the rope in your left hand (while still facing in the direction you want to go) to try and disengage the feet/brain as well, again stop the second you get forward movement.
My guy did this at first, he realized pretty quickly that if he pitched a fit and acted scared he'd get what he wanted. I really wanted to reassure him because he's a pretty insecure boy but after 2 weeks of trying that approach I couldn't even get him to the barn from his paddock. After two days of trying the approach I outlined above, he's never had a leading problem since.