Those nasty barre chords

It's almost 2 AM, I'm still awake, accompanied by cold pizza, my guitar, and 6 size font-prints of Cavatina tabs. Stuck in the fourth line out of 32 lines. My fingers and wrist hurt because of bending and twisting in an inhuman position :-). Those barre chords, I just can't get them to sound. Other people seem to crunch easily like potato chips. I checked in Youtube, and found out that at least half a dozen people are playing this piece like a piece of cake. Damn those barre chords
But I will not give up,I will climb that 32 line..Hopefully..:-)