The order on the photos is reversed... the left side is after, the right; before.
The process is pretty simple, I actually removed the wiper, then the clips around the light, and then CAREFULLY pried the lens from the housing, all on the car. I didn't remove the lens, just pulled the glass far enough away from the housing to slip my hand in with a glass cleaning wipe and rub the inside of the lens. I don't know if I recommend doing this without taking the light off of the car first, as you can probably crack the lens pretty easlily the way I did it. However, it's much faster than removing the whole light assembly.
Worked for me.
Again, do it SLOWLY and CAREFULLY!