I would like to update my tub/shower fixtures. It's a 3 handle system, with a spout and plug plate (don't know what to call that thing). I looked at sets at Home Depot and they include a pipe and all kinds of fittings. Does that mean I have to remove tile just to put new fixtures on? I was hoping that I could just remove the old handles, and screw on the new ones without any major work. Is this possible? Couldn't find anyone at Home Depot to ask.