There’s no such thing. You’re either qualified to do the job or you’re not. If I have the ability and skill to do a task, then I am qualified for it; if not, then I’m not. If I also happen to possess expertise in other areas or in more “sophisticated” procedures that doesn’t make me overqualified to do the other things.
But at the same time, having the qualification to do work that few others can means that more people can be helped, and more things can get done with proper delegation and efficient division of responsibilities.
nANIMOv 