Samuel Eto'o celebrated staying with Barca with a brace, while Xavi and Thierry Henry also were on the scoresheet in the comfortable victory.
"I'm feeling good," reflected Guardiola, "we created plenty of chances and always looked to get the ball forward.
"But we're a work in progress. There's still things to work on and it certainly wasn't a perfect performance."
Guardiola added: "We saw the best of Eto'o tonight. He played at the height of his powers - and the goals from Xavi and Henry were also good.
"The team made it easy for me. I'm only on the bench to fix errors where I see them on the field - and it was an easy night for me, thanks to the players."