Well this one I can guarantee I'll get right! It is right in the middle of the steering wheel! Feel free to jump over to Smokinvette.com and check out the C5 section for pictures of c5 Corvettes....
Yes
Remove the front bumper fascia Unplug the horn electrical connector and remove the bracket bolt
I believe that it's either a 10 amp fuse or 20 amp. Check your fuses out. It should tell you.
right side fender under the hood, the horn is easy to access and replace