How hard is it to install the harmonic balancer on a 1992 Olds Cutlass 3300 V6 engine?

Not too familiar with that engine, but never use a hammer to press it on. Go to your local Kragen, Shucks or autozone, they have a harmonic balancer installer in which you can rent. It simply screws into the center of the shaft and evenly presses the harmonic balancer onto the crankshaft.