I made the mistake of bringing my wife with me to check out the new Home Depot that just opened in Seymour, IN. "We're just going to go look around", I said. By the time we left we had spent over $100! We got a great deal on a kitchen sink fixture and a bathtub fixture (Delta brand). I got the kitchen sink one done. Now I have this new bathtub fixture to install. It's a new water spout, on/off control, and shower head. How hard is this? Will I need to get to the back side of the tub wall to install this? Or, will I be able to do everything from the tub side? The house has copper water pipes soldered together. Am I going to have to unsolder anything and then solder any of the new stuff, or will everything just screw off and on again?