It takes me about 10 mins to get the bumper off now, probably 15 the first time. Then three bolts on the headlights and they come out, swap out the bulbs and put in the resistors (I soldered, so it took a little longer). You can probably do the whole thing in an hour I would say, most likely less. I've done it 4 times now essentially.
I didn't know you had to take the bumper off. I thought you just had to pull the liner to get to the third headlight bolt.