I love the Clinton Anderson DVD's. I bought the handy stick a little pricy $40 but I love it too. They are really good. He shows the exercises on both a nervious sensitive horse and a more pushy lazy horse. Then at the end of the exercises he goes over the most common handler mistakes. And what if the horse does this do this. I have watched them over and over and over again. I definitely recomend. I think Stacy Westfall might be good to I have never seen them though.
The videos are expensive but I think they are worth it. I would rather fix problems myself then have to send the horse to a trainer for 3 months with a big price tag.
Sometimes you can find the videos on ebay