1- Get a hammer ands chisel and make a hole a few inches from the 2″ drain pipe.
2- Get a reciprocating saw and cut all around the drain opening be careful NOT to cut the pipe and cut out the base only.
3- after you make a circle around the drain opening you can then remove some tiles near the top of this pan and take the pan out.
4- Now all you do is take the reciprocating saw and cut off GENTLY the last little piece of this drain connection
You may want to put a rag in this drain pipe to prevent debris from going in.
SylvanLMP Good luck