The very fact that they have gained such strength makes it clear that victory is likely to be theirs. I think even Inter are well aware of that, but just hope they have a chance... We'll see, there's basically a week left, the whole world will be standing on its ears from such an event, then another week to get used to it 
If they actually watched Manchester United with Manchester City match, they would know better except if they want to be bias and choose to be blind to still support Iner to win this league, that is a dream I think Inter will see but would be hard to realize it in real life. Yesterday, Manchester City didn't struggle yesterday, no pressure, it was as if they are having a regular match and yet they won; I know it's because they don't want to sustain injury because the of this match but now imagine if they are playing in the final, Inter will see the real identify of Manchester city because the pitch is going to be under Siege and it will be nice to see Guardiola win Champions League for Manchester City this season.
No, they definitely felt pressure and Guardiola almost cried or he did cry even. They had to put in a lot of effort to win that game against Manchester United and even though the penalty was questionable, those situations can happen in any game and when they are unlucky, it could even happen twice against them. Manchester United had a few dangerous attacks from the left wing and almost scored a goal in the last moment of the game as well. It is not as if Manchester City has won the game against Inter already. They will be the favorites and they know it, but this game is going to be hard.