How toreplace a serpentine belt on an oldsmobile auruor

It's easy to replace a serpentine belt on an Oldsmobile Aurora.

Just release tension on the serpentine belt by using a 1/2" breaker bar on the tensioner pulley. Then, undo the belt.
Insert the new belt around the various 'smooth' and 'grooved' pulleys by matching the smooth pulleys with the back of the serpentine belt, and matching the grooved pulleys with the grooved inside of the serpentine belt in question, that you've bought from the store based on the year,make, model, and engine size.

It actually will come together more easily than worrying about a belt diagram, although a belt diagram can be helpful to understand how the belt weaves in and out of the various pulleys.

Often, there will be a sticker under the hood area where a belt diagram exists, but it's not necessary to have one to perform the service yourself.