@KatieB - @SilleeMee @Mz iMac @Desertdi before me had good ideas depending upon your preference of having them done or doing them yourself. I have another option combining both: Have your brows professionally done then keep them up using a great magnifying mirror and good tweezers! That might be a good base so you can see how they should look, and what needs to be plucked out, when they grow back in.
Once they are professionally done, keeping on top of them becomes an easy routine with great results. I find using a magnifying mirror with the light on, in a room with good natural lighting, is my preference. Light coming in from different angles, or sitting in front of a window, helps to locate those little ones that hide. They are those blonde little hairs that you have trouble seeing but that snag shadow easily.
Another thing I always do is keep up with hair anywhere. I just look at brows as another thing to do on a continuing basis so they are always groomed and in good shape. I like doing things a little at a time, even around the house and yard, so this way everything is always neat/organized without a large amount of work any one day.
Good luck!