Arnold never let the pressures of life control him. Whether he was dueling with Franco in South Africa or replacing Gray Davis as governor of California, he was prepared for every challenge.
Arnold said, "Training gives us an outlet for suppressed energies created by stress, and thus tones the spirit just as exercise conditions the body."
You need to borrow Arnold's focus to crush this leg day. Mental fortitude is more important that physical prowess. Muscular men may fall short and quit on rep 10, but mentally strong men will do whatever it takes to finish the set.