I want to tear down an unused brick chimney behind the hall wall so that I can add a return air vent. The chimney has already been torn down below the roof line. I am going to remove the drywall and get started. What tools will I need and what precautions should I take. My main concern using a sledge hammer is knocking too many bricks down at one time, causing them to crash through the living room drywall.

Chimney