find a mentor.
Never let a pt see you "sweat" they are already nervous...save the sweating for the breakroom.
know where everything is. take inventory. nothing worse then running around like a crazy person looking for the foley cath's.
if you are unsure of a medication (route, dose etc) double check with someone else.
it is ok to question orders.
never piss off the unit sec or the tech's. your life will be hell.
learn what you can and can't order. the doc's (sometimes) like to have the labs and xrays ordered before they see the pt. most places have a list of protocols for things like abd pain, lower ext complaints etc