<!–start image–><!– end image–>It’s hard to pinpoint the exact moment when Mark Sanchez settled in during his first fall practice as the Trojans’ No. 1 quarterback. It’s hard because throughout the workout Wednesday, Sanchez operated the USC offense with poise, confidence and efficiency. While he took care of things on the field, Sanchez also got another taste of what it’s like at the helm of the USC offense. Go inside for mor