Mikel Arteta will probably face strong pressure because they also have to continue to perform well in the English Premier League. If they make the wrong strategy they will fail in these two competitions and that will certainly be very disappointing because last season they failed in the English Premier League as well as in European competitions even though It's not the Champions League, but I still doubt Arsenal will be in this competition and my prediction is that they won't make it to the semifinals.
I am very doubtful in terms of head to head because Bayern Munich is too strong for Arsenal, is it possible that Mikel Arteta will give resistance to Bayern Munich, with the tactics he has because Arsenal is not that strong to face Bayern Munich, it is likely that he will have difficulties when playing at home Bayern Munich, we know that the Allianz Arena is a scary home for the clubs that play there, so it is not surprising that every club will experience defeat there.