Kathryn Hahn has joked about her plethora of “best friend or randy crazy lady” roles in comedies like “How To Lose A Guy In Ten Days,” “Anchorman” and “Step Brothers.” But recent projects by Jill Soloway (“Afternoon Delight” and “I Love Dick”) and Tamara Jenkins (the new Netflix film “Private Life”) have cast Hahn in the lead role, and suddenly we have an exciting leading lady who’s much more than a scene-stealer-extraordinaire. She lets us in on a fascinating process she has for getting into the “I” of the character, talks about the road that led to “Private Life” with co-stars Paul Giamatti and Kayli Carter, and cites the Alan Watts quote “You’re under no obligation to be the person you were five minutes ago.”