Step One: Turn off the water lines that run to the tub. Unscrew the pipes that carry the water to the drain and to the faucet. Take out the faucet and the shower head. If you plan on reusing the shower head and faucet, keep them. Otherwise take them with you to the hardware store to find new ones of the same dimension.
Step Two: Prepare the bathroom for the new tub. Repair any damage that the cracked tub might have caused. This means checking the floor and walls for water damage or soft spots. Install rim boards to keep the new tub in place. These will run around the outside of the tub and prevent it from shifting.
Step Three: Put a new drain in the new tub and put it in place. The tub’s manual will tell you the proper way to secure it. Follow these directions to the letter or the new tub might be ruined. An improperly installed tub will de dangerous for your family and a waste of money. After the tub is set, put in a new surround. If you have any questions about these steps do not hesitate to contact the manufacturer. They are usually more than happy to explain any aspect of the installation.
Step Four: Make holes in the surround for the faucet and shower head. Measure carefully to make sure all of the fixtures and pipes line up. Now is the time to put in a new shower head and faucet if you chose to buy one. Attach the fixtures to the plumbing and test the water to make sure it is coming out correctly.
Step Five: Apply caulk to seal the new tub in place and keep water out.