~~snip~~
After beating Real Madrid things were favourable for Arsenal, but they were feeling overconfidence which give them timely reminder because their strategy and approach against PSG was looking not strong like they have against Real Madrid so they fail to keep things balance.
Now in second leg when they will be visited Paris they have to do their homework because still things are under control, and they have fair chance of going into final, but now their strategy could be completely changed for win they needed to be had aggressive approach without these consequences could be not positive for them. Luis Enrique is well experienced coach, and he understands how to handle things in these conditions but now it's Arteta turn how he will go for his revenge which give his team fightback and chance of having spot into final.
Let's see if things will work out as you said; if not, Arsenal winning against PSG at home is going to be a difficult thing to happen, although it's football, and I’m also hoping to see that happen. Just that I’m curious because we already saw what happened at Arsenal's home when PSG came; they failed to utilise the advantage of being at home to win against PSG.
That’s why I’m wondering how difficult the second leg will be for them. You are right; since they won against Real Madrid, they have confidence. Instead of using the same energy for PSG, they failed because, obviously, things did not go as they played against Real Madrid.