In the first leg match Arsenal must be able to win the match and be able to score more than one goal if they want to qualify for the next round because of course Arsenal will have difficulty playing in the second leg match playing at home to Munich, Arteta must be able to take advantage of this opportunity to qualify for the next round. only he knows how to beat Munich, which is actually the strongest team in the UCL, that's why many people say that to become champion in the UCL you have to get rid of Munich and Madrid so everything will run smoothly.
This is Arsenal's chance to get rid of Munich if they really want to show their best strength in the UCL and I think the strength of both of them is clearly the same so for anyone it will be difficult to predict the result because both of them are equally strong, but don't forget that Kane as a striker in Munich has been playing for a long time in the English EPL league, of course he knows how to score a goal against Arsenal which might help Munich gain the upper hand against Arsenal even though they are playing at Arsenal's home ground, it seems that Munich will play their best to win.
Munich is also considered a team that is good at turning things around. as they showed in the round of 16, they were behind in the first leg and reversed it in the second leg.
This situation could happen to Arsenal. and as you said, if Arteta wants to be safe, they have to be ahead by more than 1 goal. It will be quite difficult if Munich is in top form.
There is still preparation time, anything can happen, but I hope both teams are at their best when the game starts.