Question: I have a large Holly (a Nellie Stevens, I think) that needs to be cut back away from the house. It's several feet higher than our 2 story house and planted too close, so that it's bumping up against the house. I want to retain a natural shape when it's cut back.. that is ,I don't want to shear it away from the house, so that it ends up lopsided. A tree trimming company said they could cut the height by ~ 6 ft and trim the sides in by ~ 2ft. But I'm wondering if that's too drastic of a cut? A good portion of the tree height would be cut off. Will that damage the tree? ALso, what time of year should this be done? Thanks!