Some folks have had success washing the old grease out of the bearing and re-greasing. You have nothing to lose by trying, and it might save you buying a bearing. My experience with removing
the bearing was that it wasn't too difficult. The "nut" that held mine on was made with a hook spanner in mind. Logan suggested I get if off with a hammer and a punch. I held it in a vice with
a chuck of thick leather wrapped around the spindle, heated it up, and tapped it off. The bearing came off the spindle fairly easily. I pressed the new one on with a home made press of pipe and
all thread.
My old bearing was an original New Departure bearing with a seal on one side and open on the other. If yours is like that, you can hose it out with solvent.