I don't see why some people think this is an auto-loss. I'd say we stand a decent chance of winning the tie. Granted they're a very good team but so are we. Sure we're not the best of the best of the best but any ascendancy requires a climb at first, otherwise Preston North End would still be top of the English league. I mean even if our chances of winning are only 10% they're still ten percent. I swear I caught someone here saying we have _no_ chance. That seems silly.
If we want to take that pessimistic attitude we can still, even then hope for injuries to Barca's squad, some sort of morale disaster occurring or even a referee fluking it in favour of us. Also we have the January transfer window to bolster our options which means we might get that striker we've all been hoping for.
The tie is late Feb/early March so there is plenty of time for things to change between then and now and give us a better picture of how we might do. Personally I'm relishing the tie, this is what being the fan of a major club is all about. This is the stage we get to play on.
To put it another way I'm pretty sure more of our squad are hungrier for this cup than many of Barca's squad and maybe that could make a difference on the nights.