"The grass is green; the sky is blue..." Breathe in through your nose and out through your mouth....deep breath.....there.
Now...everyone makes mistakes. You will too. Do everything you know to NOT make mistakes but...you will, we all do. And then you'll never make that mistake again (you'll make others but that's another story
). Remember your five rights of medication administration; triple check your meds. That's probably the most vulnerable spot as a nurse.
If you don't know what to do--ask! Find a mentor or choose an individual at your facility that you trust and ask, ask, ask. I fervently hope you find someone who will help; sometimes in the harried life of nursing, it can pose a challenge. But never try to bluff your way through it. In the end, you will be more respected for asking than for bluffing.
Get as much orientation to the job as you can. Ask the manager if you can extend the orientation period if you feel you need to. It's a nurse's market out there so take a job where you feel the most comfortable.
Yes, you will be affecting people's lives...remember to be as kind and considerate as possible, give them information, talk to the patients and their families...this is what touches their lives the most and what they remember the most.
Good luck and write back and let us know how you're doing.