How do you replace the serpentine belt on a 1990 Chevy Cavalier 4 cylinder?
You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
This is not for beginners. You have to drain the transmission, remove the axles, remove the transmission, install the new cylinder, then replace the transmission, axles, add new synchromesh fluid to the tranny, and bleed the clutch hydraulics. You can get the whole procedure from Autozone's website.