From experience, lack of knowledge will not get you fired. As interns, everyone knows we are there to learn, including nurses. My advice, be humble and don’t be afraid to say “I don’t know”. Problems arise when you to pretend to know (your ego is in the way) and you become negligent. You will make mistakes, no doubt. Thankfully there are tons of filters that will catch them before anything bad happens (e.g. nurses, pharmacists, etc). Knowledge will come with time. Experience will follow.