Ignition cylinder removal

[klwebb]

I'm new to this section of the page. I frequent the 67-72 forum normally. I might be picking up a 78 Silverado driver/project today for $800, it's in pretty decent shape, will need a new hood eventually since it's got a crease but the guy says it will drive back home (45 minutes away) as long as I fill up the radiator and replace the ignition cylinder which Oreillys has for ~$14. Could someone guide me on how to replace it? I've done it a few times on my 71 but that's pretty different than a 78.. Thanks a ton in advance!