Who has some experience with American Holly trees? I have one on a property I service that has been neglected for many years. It is planted next to the house (I mean right next to the house) with a West exposure and has grown perhaps 40 feet tall. It needs to be pruned as it is spreading out and up. It now is way over the roof line and limbs are rubbing on the shingles. This particular example has multiple trunks from the ground. It is a really nice tree, but needs serious attention. Can I prune one of these back and top it to bush size or will that harm the tree? I could sure use some suggestions as I have no experience with American Holly.