If your bath is cast iron they are extremely heavy. I used a sledge hammer to break it up. Make sure you use an old blanket or towels to protect mirrors, whb, toilet and above all WEAR GOGGLES AND PROTECTIVE GEAR (such as a boiler suit and helmet). There is a possibility that slivers of metal may fly. A sledge hammer makes very easy meat of the breaking up process. The pluming can be disconnected in normal way, just to remember to shut off hot and cold water supplies from header tank.
Hope this is of use to you
Decon
March 2006