Oh wow! Your system came! That's excellent! From what I've read EVERYONE has the shocked/dissapointed look when they first take the system out of the box. I've heard it needs a wash or two toward the beginning of getting it and that helps lighten it. How much darker is it? Otherwise I would talk to a stylist before trying to color it yourself. Lightening is usually harder than darkening.
I fully expect pics after the cut in!!!