Hehe... do you have a unibrow, Angel? After a hot shower, get some tweezers and pluck out the middle hairs. Don't do under the eyebrows unless you're sure you won't make a mistake and end up having funny looking eyebrows. I'm sure your eyebrows look fine as they are though :p
If you are timid about doing them yourself, you may be better off going to a stylist and have them done. Pay close attention when they're doing it. Pay attention to the areas they are shaping, etc. This will allow you to get a better feel of what to do if you plan on doing it yourself.
Nope. I have one single eyebrow hair that just keeps growing - it's gotten longer than the whole rest of my eyebrow. And it's blond (the others are all dark). It's become my little project to see how long it gets :)