There's a thing that even some small battles now prevent large "status quo" things later
Can you elaborate on this please?
It's just a method of picking your battles.
Sometimes, certain issues aren't the biggest issues in the world and there's no need in that case to go nuclear war and $8,000 attorney fees over getting every other Groundhog-Day-Eve in the decree as a holiday.
On the other hand, there might be a small issue that the Ex is trying to nickel-and-dime you over...it's not the biggest issue. But it might be important to stay firm on that issue to:
* set the boundaries now with the Ex so you don't have the Ex going ballistic over penny-stuff for the next dozen years ("nip it in the bud" strategy)
* to prevent what was a little thing and you tried to be nice with a one-time exception and the Ex trying to claim to a court later that it's always supposed to be that way ("status quo" argument)
Deciding whether to be firm or compromise though will end up being your decision as how you see it. And yeah, it takes a little practice, and there will be hits and misses.