We are all human and Mistakes happen, but thank goodness your patient was not harmed.
Just be sure to:
1) Always know AND practice within your scope of practice!
2) if you don't know about a certain device, procedure, medication, please please please don't use it or give the med without looking it up and consulting another nurse.
It is really scary when people just assume " it's okay" when it is far from it.
3) Acknowledge your mistake, be honest about it, and learn from it!