FZRA
It's essential that students carry out practice pans. Not just so that they know how to correctly use the frequency. A large amount of students are nervous of using the radio in the first place, never mind using 121.5. We have to show them how good and friendly the guys and gals at D&D are so they don't hesitate when the time comes for prompt action.
As an aside, I got a student to do one for "unsure of position" once. When asked if any further assistance was required, I made the negative reply with the usual thanks myself. My mobile rang the next day. It was an ex-instructor of ours who'd been flying his Boeing the day before. He said; "It's a pretty poor show when the CFI gets lost around Rickmansworth!"