1992 Oldsmobile cutlass sierra

First you need to go to the local parts store and get a steering wheel puller and a clock spring compressor tool. You can rent them but just cheaper to buy it and return it. I got mind like 35 bucks together.
You will remove the horn button just by pulling it towards you be careful not to rip the horn wire out. Next there may be a retainer clip remove it with a pair of needle nose pliers. Next get a breaker bar or a impact gun to back the center nut off. Once off use the steering wheel puller by inserting the threaded bolts into the threaded holes directly beside the center pin. ease the puller onto the center pin and tighten down until the steering wheel starts to move back towards you continue until off. On some trucks there is a steel plate covering the housing to the left side and towards the top are two small torx screws remove them and remove the cover. Next grab your clock spring compressor and install it similar to the way you did the wheel puller you will tighten down the center bolt slightly decompressing the clock spring. as you compress the clock spring look to the center there is a small retainer clip that looks like it is made into the center pin pry the clip off making sure not to damage it and remove the compressor tool, remove the clock spring making sure to pay attention on how it comes apart you can put it all back together. Remove the turn signal switch should be 3 phillips head screws. You may need to disconnect the horn wire at this point it just turns slightly and pulls out. After you remove the clock spring you will see the lock cylinder body, follow the body towards the center pin. There will be a small torx bit or a phillips screw to it will be silver and very shinny at the end of the lock housing remove it and slide the lock cylinder out. Install the new one and reverse the steps.
hope this helps...........good luck!