selective color tutorial - GIMP

I don't write a lot of tutorials, mostly because my descriptions are often confusing; but I notice a lot on Facebook people wanting to do selective color on photos of their children and such; so here is an actual tutorial for you. I posted it quite a while ago on my dA page, but it works for the latest updates of GIMP as well.
If you don't have GIMP it is free to download and while it's not photoshop it is a decent equivalent of it.

Some photos I've done using this method: