The Champions League final is a completely different kind of match where there's no room for mistakes. All those previous matches had return legs, where teams could "fix" things if something didn’t go well. Here, we’ll actually see who has more experience and who has the better tactics. But yes both teams have a crazy attacks,it will be very interesting to watch.
Mentality is very much needed in a high tension match and it will greatly affect the performance issued by a team and in the Champions League final match of course it will be different from other matches, the pressure on the field felt by the players will be very different but for Inter Milan and PSG players I think they have enough experience for all of that.
Seriously, the Champions League final is going to be a tough one and a different one. As you said already, there is no room for mistakes because any team that makes a wrong move will be sad for that team. Both Inter Milan and PSG are not weak teams, and for these two teams to meet in this stage of the competition,
we already know it's going to be a tough one. The match is still yet to be predicted, as both teams are not going to give each other any chance or opportunity; the best thing is to wait till the deal day.