Teresa, Somebody better than I will have to tell you how to make difficult hair selections.
If you don't get that help, you can do what I do -- cheat. I don't even try. I simply arrange the photos inside a frame. This happens to be square, use whatever works for you. This example uses the low res images you posted, it will look better when you work with your original files.
I put the cute girls inside hard-edge frames. You can blend it the way Courtney did in this montage:
I suspect she was staying away from selecting hair
(Ooops, I misspelled Kaylee when I named my attachment)