A good set of eyebrows can define your face nicely. Eyebrows that are out of control on the other hand, make you look like a caveman. This one is easy, if you see any hair growing between your eyebrows (mono-brow) then pluck it out with some tweezers or your fingers. Eventually the hair stops growing.
Don’t be shy, ask your barber to trim your eyebrows. This is essential to avoid the mad professor look. If you can afford it, buy a small trimming kit. With this you can trim eyebrows, ear and nose hair.