I did it to mine on the WRX.
Remove light assembly from car.
On the back of the lights, there may be some small screws holding them together. On mine there were 3-4 as I remember.
Remove the bulbs and wiring/pigtails.
Put the lights in the oven at 195-200 for maybe 10 minutes. Check' em once or twice to see if they will start to pull apart. Better to take your time than leave them in too long.
Use some gloves, put some newspapers on the table or bench you are going to take them apart on. You will get some of the sealant on your hands/gloves and clothes. If you get it on your hands it sticks and can burn you pretty good.
Lightly sand the chrome reflector where you are going to paint. Mask off any place you don't want to paint. I left the parts around the actual headlight bulb and directional bulb, chrome.
After the paint is good and dry (a couple days), Put the reflectors back in, Put the lens and the housing in the oven, the sealant will get soft and sticky, re-attach the lens to the housing.
It actually is pretty simple. Don't rush it, think about what you are doing, and you shouldn't have any problem.
Here is one link that will help. Not the same year and model, but it should give you a pretty good idea of what to look for and how to do it.
http://forums.nasioc.com/forums/showthread.php?t=1763677&highlight=paint+headlights
Post #3 here gives temp and time.
http://forums.nasioc.com/forums/showthread.php?t=2041588&highlight=headlight+paint
Good one here also.
http://forums.nasioc.com/forums/showthread.php?t=749614&page=2