i was concerned about nailing into a tree as well. but, the tree did not damage. i just don't see it as that big of a deal. it's not as disrespectful as, imo, cutting it up to have some sort of shapely shape. or cutting it down because "it's in the way". but whatever, to me, it's such a small issue that it's basically non. so many other things so more important than if someone wants to put a face on their tree. i'm not concerned about it. the face falls off as the tree grows.