I used wet run-of-the-mill A4 paper and a socket that was the same size of the ID of the bearing. Just keep packing the paper in, tapping it down with the socket, and eventually it'll pop the bearing out.
You can also just do the above method with grease which is normally faster, but I have had more success with paper as grease tends to work its way through the bearing and pop out the cover/seal thingo. Also grease is faaaaar messier.