Hit it hard with a hammer like it owes you money.

The new one will slide right on. Just clean the mating surface up a little, I used like 1000 grit sandpaper, put a very light film of grease on... and push(wiggle) the new bearing on. I had to "pull" mine off by hand a couple times before I reinstalled the driveshaft. No problems.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D