At this point, the tub has dropped down to the floor level.
I leave a bit of drywall out on the room side of the tub on the end away from the drain.
The apron will fall into that space.
I leave a 2x4 on the floor to prevent the tub from dropping too far.
If I need to lift the drain side of the tub up, I can use a second 2x4 and lever it up, using the 2x4 on the floor as a pivot.
This way, I'm pushing down, and not lifting up.
At the last bit, I pull the last 2x4 from below the tub.
If the tub needs sliding in, I can sit on the floor, and use my legs to push it in.
If the tub is in the room, I can set it by myself.