How easy is it to file down a small bony bump that's on one side of the nose only?

Generally, I really like my nose--but there seems to be some extra bone growth on the hump of the nose and below the eye on the left side only. When I touch the bridge of my nose, I can feel that the bump is significantly smaller on the right side. This asymmetry leads to a crooked appearance. How invasive (and expensive) is it to equalize the bump? I don't want to walk away with a radically different nose. I just want the top half of my nose to look more symmetrical.