Actor says she was ‘woefully unprepared’ to pull off ballet moves in Black Swan but risk ‘led to one of my greatest personal and professional achievements’Natalie Portman has advised graduating Harvard seniors to use their inexperience to their advantage, saying she has learned that taking calculated risks can lead to life-changing rewards.The Academy Award winner, speaking at Harvard College’s class day, cited her work in Black Swan as an example of a time she did not know her own limitations and it paid off.