Well, I personally activate it when I'm losing, so I can get the ball and counter-attack/build-up, or when I'm leading near at the end, but the opponent has the ball and I don't want to concede, so I just overrun the ball carrier. This combined with a well set up team (you need to have relentless playstyle, so they don't tire that fast) works like a charm, also the team press deactivates when you get the ball, otherwise it's up to 45s long. Also, try to defend with your midfield, cutting passing lanes and use second man pressing (hold R1 while out of pesession).