Raise the Tub Up and Remove Fixtures
Use a crow bar to raise the tub, then slip a 2 x 4 underneath to raise the tub up and away from the floor (Image 1). This will allow room for you to slide your fingers (with the help of a strong friend) under the tub and lift it right out of the frame (Image 2).
Remove the remaining tile from the frame, then remove the cement board.
Remove the remaining 2 x 4 frame.
Remove the tub handles (Image 3) by loosening them with an Allen wrench.
Unscrew the escutcheon plates.