A harmonic balancer puller or a steering wheel puller (heavy duty). The harmonic balancer is actually two wheels in one, inner, a ring of rubber and outer. Tapping near the center with a hammer may help get it moving after some pull, with a puller is applied. Beating on it isn't gonna help much, will probably separate the inner from the outer and may just smack the crank back and forth enough to damage that also.
There are a few tools, you pretty much have to have. Steering wheel puller is one, you use it rarely, but there really isn't an acceptable alternative. A steering wheel puller, is about half the price (or less) of a new harmonic balancer.
When I was young, I tried to fix everything with a bent screwdriver, a broken pair of pliers and a BFH. Over the years, often at swap meets, I picked up a decent set of tools. They don´t have to be Snap On, they just have to work.