No problems here! When I was a hairstylist I did waxing and tweezing professionally as well! Although, I will say too much was taken in an area when I was waxed once (lol oh boy and I barely have any eyebrows as is)... I tweeze mine, because i do not have a wax warmer (I prefer hot wax to cold)!
I've done that before- i was talking to my friend and completly not paying attention to what i was doing- next thing ya know 1/2 my eyebrow was gone just take an eyebrow pencil that is similar to your natural eyebrow color and lightly feather it on your skin to fill it in.