Ignition Cylinder Replacement

My keys went missing and the GM computer has the wrong key# for my VIN so the replacement keys from the dealer don't work. Going to have to replace the ignition cylinder to get my 1992 Trans Sport back on the road.

Anyone done this? Any tips? Is there a good manual to refer to for a good exploded view to understand what I'm working on?

Thanks,
Ben

YOu posted the same also in the APV and transport forum...Please remove your posts in the APV and the SIlhouette forum (click EDIT then DELETE) as it is duplicated in the transport forum.