Drilling above your head is a pain in the ass. Your arms quickly hurt and you get covered in mess. It goes in your hair, in your eyes, mouth and nose. But it does not have to be that way. I can’t really do anything about your arms hurting. Well apart from a little advice for that. Use a lighter drill and if possible, a smaller battery.
But on to the point of this post. To stop getting covered in mess, do this. Drill through a disposable cup first. That way, all the mess will fall into the cup. Not onto you.