When Warner Bros. hired Cathy Yan to direct Birds of Prey: And the Fantabulous Emancipation of One Harley Quinn, it was a momentous occasion. Yan become the second female director entrusted with with a Warner Bros./DC Comics movie after Wonder Woman helmer Patty Jenkins. Now, just a week before the Birds of Prey premiere and in a new interview, Yan is revealing some advice her fellow Warner Bros. director gave her before she embarked on making the movie. Speaking with Variety, Yan covered a wide range of topics related to her work on Birds of Prey. One of those …