Just did this...there is a ledge on the outside of the rear of the pan, that you can gently pry against without damaging the mating surface.

If you have all the bolts out ( I initially missed one of the horizontal e-torx ), it should come out...

And yes you do have about 1/2 of the car apart....

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'99 E39 528i 5-speed 130k
'06 325Cic auto 115k
'05 X5 3.0 auto 173k-SOLD
'03 530i - manual swapped - 430k miles-SOLD