I would be very confident of beating Liverpool. I've watched Liverpool a fair bit. Great side, club and manager, but they haven't played anyone who come close to the attacking quality Barca have. And that's why they haven't been exposed, where they should have been exposed, at full back. Both Trent and Robertson have defended poorly all season.
It's a testament to the poor attacking quality in that league that Liverpool can dominate it with only one defender who can actually defend at a high level ( Van Dijk ). Lamine Vs Robertson and Raphinha Vs Trent is not something Flick will allow Liverpool to get away with.
Infact, if we were playing at Camp Nou, I would mortgage my house and put all the money on Barca to win the UCL this season. I'm that confident we would win.