The 16 year old landed her big break in the critically-acclaimed 2010 Western, in which she appears alongside some of the industry's greatest actors.
And to make sure she made the most of her time working with her idols, she scrawled things in a notebook so she would always remember the experience.
She tells Fashion Magazine, "The conversations I had with Matt, Josh and Jeff on set totally changed my life... They changed the way I approach acting. It was an incredible education. I kept a journal on set that carried through the first month. We took over 4,000 pictures - I was looking through them last night and I got chills."
Steinfeld reveals she also picked up a few tips from Keira Knightley after starring alongside the beauty in upcoming drama Can A Song Save Your Life?, which features Mark Ruffallo, Adam Levine and Cee Lo Green.
She explains, "It was my first time filming on the streets of New York. It was very overwhelming - the paparazzi were surrounding us everywhere because the crew caught so much attention. I didn't know how to handle it so I looked at Keira for help. She was just so graceful, so calm and collected."