Brad,
Fortunately, getting the head off is fairly easy:
*Remove seat and gas tank.
*Drain out your coolant.
*Remove your spark plug.
*Remove the coolant line coming into the head.
*Remove the head mount that connects head to top tube on your frame
*Should just have the bolts connecting head to cylinder left.
That's it. I think.
Ron also does a carb mod, which I've done on former KDX's, and it is also a great mod. If you are close with your jetting though, I'd recommend just the head mod.