I'm not getting why you think you need to override the cruise control. I had that concern when starting out with ACC, but I set its follow distance to something generous enough that it would trigger a speed change before I got anxious about it failing to trigger the change. That let me learn to trust it.
Although now that I think about it, I was using the Subaru ACC, so the dash has a visible indicator if it's tracking a car and maintaining speed relative to that. Perhaps yours doesn't have that?
