Place a sawhorse or waist-high table underneath the center of the porch swing. This will relieve tension on the chains, allowing you to turn the swing.
Unhook both hanging chain hooks one at a time. The swing will be supported by the sawhorse or table.
Lift the porch swing and turn it 180 degrees so it is facing the opposite direction.
Reconnect the chain hooks. While holding the porch swing in place, remove the sawhorse or table. You can also use another person to help with this task.