I have a very large burning bush that I would like to trim and prepare it for next year. It is now chilly 35-45dg's and I was informed that this is a good time to prune it but I am not sure how far down the branch I go. As you can see on the picture attached, the leaves are really only on the very edge of bush which leads me to believe that I need to expose the inside to more sun. My main goal is to keep the bush healthy and not let it grow too large. Any help is greatly appreciated.