Hey there! Sorry for the delay, I just got back home and then I needed to go through the tutorial to remember what I wrote
The curves/variations/hue-sat stuff probably does have to do with the difference between the Photoshop versions. CS4 does have variations and the ability to edit them, as does PS7, and I can't imagine that CS2 doesn't. Where you might be going wrong is here:
After you've clicked "More Green" one time, close the variations dialogue box. Go to Edit in the top menu, click, and then select Fade variations. It should come up.
(Basically, the goal of this step is to increase saturation and contrast. Workarounds might be playing with saturation and contrast settings, or maybe duplicating the top screen layer and setting it to Soft Light.)
as a new adjustment layer, you meant on the same last screen layer that have sam on it, right?
It should be a new adjustment layer above the Curves layer. However, the way that PS7 and CS2 handle the values for things like saturation and contrast seems to be different. You'd probably have to play around with the values to get an approximate result.
actually, selecting hair was always a problem for me
My solution, after spending entirely too long with this same problem, was to use the smudge function in the palette. Pick a natural-looking brush (not something with hard edges) and set the strength fairly low, probably around 10-15% at the most, and clean up the rough edges. The part to watch out for is following the natural contours of the hair, and not overdoing it.
Unfortunately, I don't work with CS2 (I have PS7 and CS4). I'm away from my regular computer at the moment, but when I get home I'll take a look at CS4 and see if the option is there. (If it isn't, I can't imagine that it's there in CS2.)