The walk in showers are the only partial projects we accept doing. This is because it’s relatively easy to replace a bathtub with a walk in shower, as long as the tray for the shower enclosure is the same or larger than the footprint of the old bathroom.
You will still have to change the panels or tiles in the shower area (since the tiles or panels on the bathtub don’t go to the floor, but only to the bathtub level).