Please help - Harmonic Balancer Removal

[Boulder69]

This may sound like a dumb question, but how do I remove the harmonic balancer on my 95 LT1? When I try to loosen any of the three bolts that hold the balancer/pulley to the hub, it just turns the crank. Is there something I am missing here like a special tool to hold the hub while I remove the balancer/pulley? Then how do I loosen the center hub bolt without turning the crank? Thanks to all in advance. -eric