Ive installed LED bulbs into my low beams.
pretty easy...some things to watch out for.....
1) dont buy bulbs with fans on them for cooling, the fans crap out, get ones with a decent heatsink instead.
2) buy bulbs with leds on both sides of the unit so that they send light up and down at the same time inside the light housing.
3) they are hard to hold in place as the retention clips for the normal bulbs dont fit around the LEDs as the leds are larger, i solved this buy using hot melt glue to hold the leds into the mount. (works fine)
other than that everything was quite easy, straight forward and just a little hard to get ya hands in the back of the housing to put bulbs in.