There is wallpaper on the wall. Can I handle it?

It's best not to nail it. If the hanging thing is not too heavy, use a hook. If you nail the wall, it's easy to damage it. If you knock it down with several hammers, the nail may not be firmly fixed and a hole will appear in the wall. If you paste the wallpaper, it will definitely destroy the overall effect of the wallpaper. I suggest you don't nail it well!