Hard work is quite needed to get a better handle of a different culture.
It may include reading books, listening to music, watching movies as well as discussing with others about it.
Most important of all, pay attention, observe and ask questions with an open mind.
All these activities require time and effort. It is logical that there is extra work as you did not grow up in that culture.
Like learning all new things, nothing can replace hard work which is a key element of success.