I've done it a few time and till now its about the hardest job I did on the vette but ones you know how to do it it's possible.
The switch is bolted down by two small bolts, you can acces them by removing the little dash piece from under the steering column and lowering the steering column. The front one is hands only the rear one is a stud because on top is also the headlight switch mounted with a nut. You acces the bolts from the left side. From the right side you need to remove the wiring harnes connectors (2), if I remember correctly they both have 2 locking "pins" you need to puch to remove the connector, I think it was easier to first unbolt the switch so you can move it to the right and then disconnect the connectors. But before you can move the switch to the right you need to move it up to remove the steel rod that comes from the keylock that controlles the switch. Ones you've done that you can move the switch to the right. I always find it easier to first unlock the wiring harness under the switch that is clicked into a plastic bracket. After you've done this you can remove the connectors and the switch is "free". When reassembling it took me a while to see the switch needs to be turned "down" but that's just the way it is.
Depending on how flexible you're it's maybe easier to remove the driversside seat first.
Good luck!
ps. I forgot, you also need to remove the ventilation ducting under the steering column.
Greetings Peter