"I got very lucky," she says
"It hurt so much less than I thought it was going to hurt"
"That mammogram just saved your life"
Actress and comedian addresses struggle with humor
Bestselling author underwent surgery a month ago
"Walking Dead" and its companion talk show, "Talking Dead," premiere, while Jennifer Aniston, Alicia Keys and Demi Moore take on breast cancer for Lifetime
The Oscar winner tells "Entertainment Tonight" a tumor was removed recently, but she is now cancer-free