Remove all items from the top section of the armoire. Keep the two top armoire doors open.
Wedge the top jamb free with a pry bar. The top jamb contains the connectors that hold the doors shut, and is nailed to the front of the armoire. The nails are sunk within the wood, so the entire piece must be pried away. Not all armoires have a top jamb, but if your armoire does, it is nailed to the top of the cabinet and must be removed.
Stand above the top of the armoire on a stepladder or sturdy chair. Pry off each piece of wood bordering each side of the top piece. These pieces are also nailed in place and secure the top of the armoire to the body of the cabinet. Not all armoires have these border pieces.
Pry off the top of the armoire once the perimeter pieces are free. The top is nailed into the body of the unit.