Here's an answer I haven't seen yet.
A friend of mine coached baseball for many years. Very small town, so our teams usually flirt with .500 seasons because most of the schools in our region are much bigger. There are no size classes in this state for any sport other than football. One night at BP, he was telling a story to the middle school girls we were coaching, and it went something like this.
"I had a team several years ago that was beating teams we had NO BUSINESS beating. I had 6 freshmen starting. We played a lot of small ball, but I think the biggest reason they were winning was because they were too inexperienced to realize why they shouldn't."
That team grew up and eventually made the equivalent of the sweet 16. Five of the boys had scholarship offers, and the ace pitcher went to the SEC.
There is definitely something to the idea that a lack of awareness can actually be beneficial.
Our girls have the exact opposite problem. They're so focused on how good the other team is they add unnecessary pressure on themselves. It's a real mental hurdle I can't figure out how to overcome because I never experienced it as an athlete. I would be nervous before games, and during other times could really battle confidence issues, but during games I was always locked in. I failed plenty as an athlete, but it was never because the moment was too big or I was too intimidated by the other team.
Our pitcher told me that some of the girls have said they love practicing but hate playing games because they get so stressed out and nervous about losing. I have no idea how to deal with that. Many of them who play with me in the summer perform better then, and there's even a sentiment that they like the summer games more.
From a quality of competition standpoint, our summer opponents tend to be decent. They're never as good as the very best teams we face, but only one is an "easy win" type.
I have no idea how to get them to either not feel unnecessary pressure or to embrace it.