1985 Oldsmobile Delta 88 Royale Brougham -- horn problem

I own a 1985 Oldsmobile Delta 88 Royale Brougham, 5.0 Liter (Engine Code Y) V-8 engine, with roughly 82,000 miles. For the past few weeks the horn has gone off blasting for no apparent reason (i.E, without me depressing the horn pad or buttons on the steeling wheel), and the horn will not stop blasting. It is often cold outside when the problem is bad. The problem sometimes occurs when I brush against or pull on the steering wheel. I have found that warming up the car and driving temporarily addresses the issue; however, this is no longer a good enough solution. This morning sometime before 5 a.M, the horn (the car was locked) went off on its own as I and my neighbors were trying to sleep. I was awakened at 5 a.M. By a neighbor wanting me stop the horn's blasting. I had to drive my car away to end the nuisance. I have the owner's manual which says squat about anything concerning the horn. I do not have a repair manual. I do know that the horn does not work when the battery has been drained and needs a jump; clearly an electrically-related problem. What are the possible explanations of and solutions (incl. Temporary ones) for this horn-blasting problem? Can I have the horn somehow disconnected without damaging the horn? Will cutting some wire be necessary? Where is it located? Is the problem possibly inside the steering wheel? Or elsewhere? The owner's manual is silent about a fuse for the horn, & nothing in the fuse box identifies a slot with the word "horn." Is there a fuse to remove to end the blasting? If so, what is the specific location of that fuse? If I remove that fuse, what other electrical systems might be effected? What are long term solutions? If I go to a mechanic, what are reasonable prices to pay for (replacement) parts and labor just to have a wire cut or the horn simply disconnected? If a wire is cut, how difficult will it be to reconnect the wire at a later date?