It took me maybe 30 minutes. I went with removing the belly pan and bitching and cursing and squeezing my hand inside the bumper and around the windshield washer reservoir. I could probably do it again in 20 minutes, but hopefully I won't have to for at least a year!
The stock fogs were totally useless and the color sucked. I figured even if the yellows didn't help, I already knew I liked the look. I had my first trip in a good rainstorm and it was an improvement. Not huge, but an improvement. There isn't a sharp cutoff, so there is some ambient light above the headlight cutoff, but not a ton. I'm happy with them...if the bulbs last.
From what I read, go with Nokya or Luminics. The PIAA aren't very yellow, the Hoens had spotty reviews, and the cheap eBay ones are, well, cheap.