How do you change a horn switch on a 1990 Buick Reatta?

To change the horn switch on a 1990 Buick Reatta, first disconnect the battery to ensure safety. Remove the steering wheel by taking off the retaining nut and using a steering wheel puller if necessary. Once the wheel is off, access the horn switch located beneath it, disconnect the wiring harness, and replace it with the new switch. Reassemble the steering wheel, reconnect the battery, and test the horn to ensure proper functionality.