You probably are a step ahead of me on this, but make sure you are trying to turn the fixed cup CLOCKWISE. Otherwise, follow Nick's advice or the very similar procedure outlined by Sheldon Brown. When I wanted to get the 1959 Capo repainted, the OEM fixed cup put up such a fight that I had to let Jim "CyclArtist" Cunningham use his professional BB tool and his floor-mounted vise-on-a-post.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069