Replaced my horn this weekend and feel great about it! I know its a fairly easy job but it's a big deal for me!
So a few things:
I'd suggest buying a whole set of those plastic clip things that most cars use to attach things like bumpers. I noticed that the ones on the underside of the front bumper were brittle and tough to remove. I broke 2 of them as I tried to pry them out. They are cheap, might as well replace all of them at once.
After removing all the plastic clips and the (I think 6) bolts/screws I was having trouble getting the bumper off. Turns out that the bumper overlaps a little bump where the screws go in at the wheel well. So, the corners of the bumper. The bumper, another body piece and the wheel well liner all sort of overlap here. You need to lightly pry the piece of bumper plastic over this little hump to get the bumper off. Same with putting it back on.
Otherwise, it was super easy! You have to cut the connector off of the horn wire but don't be afraid...its easy. Just strip the casing off the wire and crimp it onto the new horn connector.
I bought a generic replacement horn from Napa...only like $12.95. It was labeled as having a "low" note but unfortunately it still sounds like a scooter. I'd suggest something else.
I have pics but don't want to figure out how to get them in my message. Oh well. Next weekend I do the rear differential fluid change! I love doing this work myself, so rewarding!