That bearing should not be that tight of a fit on that crank that it takes a crazy effort to remove, the case press fit should be tighter. Only the inner race of the two part rollers are supposed to be tight. If the bearing bore in the case is so loose it allows the bearing to slip in and out easy, I would use some bearing retainer compound after a proper degreasing. This works in this application, but not so well if the inner race/crank journal fit is loose.
As advrider suggests, a bearing separator will get under the bearing. Retain this in a vise, and a few good taps on the end of the crank with a plastic hammer should do it.
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