elaborating more on the 'can you fly the nav yourself'
You gotta know your aircraft inside out, its capabilities, settings, navaid failures (especially if you fly glass cockpit), mode settings, what each and every button and dial or guage means. Dont leave any stone unturned cuz when you get a question from your student and you dont know the answer or if your in the ****e and an abnormal occurs your the only fail safe there is.
good luck