i am replacing the old drain pipe, which is leaking with pvc but i do not know how to cut the cast iron and how to connect the new pvc to the old cast iron that exits the house. i want to cut the BIG pipe and it is up at the ceiling on first floor it is well rusted so i have to cut it. i need a safe way to cut the pipe. HELP!!!! FYI i live in wi. for code. Thanks for your time.