Speaking to TNT Sport about Arsenal's 2-2 draw against Bayern Munich, Mikel Arteta said: "The game had different moments. We started really well, we were dominant, didn't concede anything.
"We scored a really good goal and after that is the moment of the game when Ben [White] is in front of [Manuel] Neuer and if it was 2-0 it would have been a very different game.
"They scored and it created some uncertainty, the second goal was unusual for us to concede but it is the Champions League, you make a mistake and get punished.
"We allowed them the spaces to run and they were very dangerous but even at 2-1 we tried to make a rhythm, we were composed and didn't try to rush things and the changes had an impact on the game.
"In the Champions League you give something they will take it. You get punished. That is part of football as well. The things we can control is do the simple things better.
"I have a lot of belief we can go there and beat them. We have to prepare really well."
Arsenal have everything to play for at the Allianz Arena in the second leg. After having won four of their last five Premier League away games in dominant fashion, the Gunners can afford to be confident against Bayern next week and get the job done to move onto the semi-finals.
