Bathtubs can be installed on the floor, on a platform above the floor, or into the floor. Whether you are installing bathtubs for the first time in the bathroom or just replace the old tub, the process is similar. But if your project is new installation the process is more complicated. It is important to make sure that you've qualified yourself for the job. Before moving the tub into the room, check your measurements to make sure it will fit.
First you need to cut a drain opening the floor. This should be an oversize rectangular hole. Install an access panel behind the faucets and supply pipes so you won't have to remove the wall to work on them.