just be sure to dis-connect the battery before you start and you should be fine.

I've seen this happen on 3 different cars before and and all 3 times it was the horn itself not the switch...

just something to keep in mind.

you can of course test this by finding the electrical harness that goes to the steering wheel and disconnecting it. it will be separate from the airbag harness and you might end up disconnecting all of the steering column parts as well... so while you wont want to drive it like this, it would be a-ok for leaving it like that over night to see if the horn goes off in the morning...