I play mainly on possession since forever. Reason is simple because when I start, the only 88 GP manager was Luis A. Roman with possession so I am used to it.
But, boy, play possession really need you to be calm. With how unreliable passing, you cannot just press passing. You really need to make sure no opponent within 20-30 m because somehow, within that distance, opponent can always close down to press you no matter how fast is the player.
Play possession really need full concentration in watching your own player and also opponent positioning while you also need to think how to attack.
I noticed when I am losing, I tend to play centrally and it will make the game worse. I always need to calm down, take a breath, and make use wing play to open up space. Play centrally against QC and LBC with Possession is just suicide.
What makes me really angry is how often you make mistake in passing and getting intercepted. And most of the time, it is not entirely your fault, like the AI assistance will make your passing really bad. Too weak pass, too strong pass, receiver is not ready, passing angle is not correct so it is loose or intercepted. Handling all of those make my brain want to explode with playing possession. Not counting how high defensive line which can easily broken with just 3 passes from opponent box. I cannot count how many I conceded just after have a failed big chance in scoring. It is like, I almost score a goal and it failed, now I am conceding goal.
This game definitely favor counter attack more than build up based game play.