Late to the party, too, but I would never try to remove a fixed cup unless it was needing to be replaced -- yes, as BG says, they're called that for a reason! Wiping out the old grease, maybe chasing with a solvent-dampened rag, close look through the BB shell with a flashlight. If it's not pitted and corroded, -- and it hardly ever will be: those cups are pretty tough -- in goes the new grease and balls, that's it.

Now, lacking the proper tools, how did you get it driven in hard enough so that it stays "fixed"?