The trick is not to ruin the bearing seal...........it's not to ruin the bearing. The temtation is to pry out the seal using the bearing face for leverage. This will insure that you'll be buying a new bearing.

The proper procedure requires you to hook the seal from above and tap it out with a hammer that can impact the tool that you utilized for the hook. It's a bit of an awkward deal but it saves the bearing. I just did one on the SD and, without a good vice, it took 15 minutes of futile attempts until it finally gave up.