I found a 50+ year old boxwood that was intended for someone's yard, but never got planted. This thing has some height to it, and I want to scale it back. It has multiple trunks with a rather large main section where the trunks meet. Can I get away with chopping all the trunks at once, or would it be better to chop on trunk at a time? I do not have a picture yet, but I will have some early next week.