I am sure my question has been answered before but I looked and looked and still can't find the answer. My bathtub is badly stained and I am working unsuccessfully to remove those stains. When I accomplish that I want to replace the fixtures, to include the metal circle under the faucet and is it possible for me to remove the one by the drain. I have to do it all myself since I can't afford to get a professional. The pipe that comes out of the wall for the shower is partially rusted... is there a way I can replace that little piece without damaging the wall. It is approximately 6 to 8 inches in length. Thanks,