Well talk about ten points for effort!
If I did that it would be one molten, burnt sad excuse of a circuit board!
can you get the replacement LED's in green and on a scale of
'once i soldered some speaker wire'
to
'I just soldered my own version of a intel 6700k with nothin but a coathanger and some pinapple'
would you grade the difficulty of this job? I think they look amazing and would love a green version
Depends how much confidence you have really.
Not enough heat and it won't melt the solder...to much heat and you will burn out the led.
If you are doing it yourself you'll need a professional soldering iron with a super small tip and adjustable heat controls.
Practise on the window switches or something first to build up confidence.