removing the horn is not a simple job, i had to change my louvers out as the old ones broke and it was a bitch!
You have to remove the front bumper (easy 5 min task)
then you have to remove the damn radiator, this is a bitch because you have to drain the fluid and then refill once you put it all back together.
then you can access the louvers which is where the horns are held in place.
HOWEVER, if you have small hands it could be possible to get the horns out while only pulling the rad out of place a little and not actually removing it. only way to tell is to try, as but i don't remember how much wiggle room there was
Horn - 2nd Generation (Remove and Replace)
Active Louver - Center (Remove and Replace)