I know the hair that I am having trouble with is just "wisps" and "fly-aways", but I find that when I discard these I lose a sense of "realism" in the picture.
I find that using the red channel, and playing with the curves, I get pretty good contrast, but that's where I get stuck, because my masking attempts end up looking to harsh or too weak (I know i'm not explaining myself very well

) .
I'm writing from my other computer at the moment, but will try and post a picture of the results of my earlier attempt tomorrow.
Also, the original picture isn't that blurry, but I scaled it down to fit in the size requirements, and I seem to have done a poor job.