Janice,
Sometimes you can do the replacement through the opening for the faucet. If you have a two or three handle faucet, you can use a "remodel plate" which will cover a large hole and hold the new faucet. They make them for single handle faucets. In a pinch you may find one for a triple too. Terry

: I live in a home that is 8 years old. I have two full baths on the second level that back up to each other. There is no water closet to get in and do any type of repairs. I want to change the faucets in the tub shower for both. How can I do this, when I can't get into the wall? Help!