Throttle valve adjustment

Vehicle is a 73 Sport 340 with the 200-4R transmission. Just finishing my restoration. Looking at adjusting the TV cable. Videos on YouTube all have slightly different methods. Some say extend the cable fully, open the linkage to WOT, and that's where the cable attaches. Others say to seat the adjuster, attach the cable, and go WOT one time and it will self adjust. Some show adding a small spring between the lock nut and the carb linkage. Others leave it out. Can any of you 200-4R guys who came ahead of me give me a definitive method that worked for you?
Maybe I'm not picturing this right, but if you extend the TV cable fully, open the throttle to WOT and attach the cable there, how could the throttle be able to return to idle?
I would get an actual GM service manual and use the factory method as best I could. YouTube is nice, but it's just like the rest of the Internet: Believe & Use at your own risk.