It's not really all that simple. You need to drop the front bumper to remove the headlight assembly, and then remove the ballast and bulbs from the headlight. Next, bake it in your oven to open the headlight up. 225 degrees F, 10 minutes, no preheating. You may have to throw it in again after prying open one corner.
Now that you have it apart, you need to decide what to do with it. You can take out the orange diffuser, but IMO it looks like crap without anything there. There are no aftermarket diffusers out yet, although I hear that one is in the works. Your other option would be to smoke it using a spray tint; this would look allright I suppose but would probably dim the output of the sidemarker to the point where you probably wouldn't be seen from the side at night. Then you need to worry about sealing the assembly back up so that moisture doesn't get in. Use butyl caulk, and heat it in the oven again before sealing.
There's also the JDM assemblies that already have smoked sidemarkers, but they're all RHD beam patterns, and not cheap.
I personally would wait until there's an aftermarket diffuser.......