By bigggest piece of advice, which I sense by the tone of your post that you already recognize, is that you don't know everything. You aren't expected to know everything! Even the seasoned nurses don't know everything!
So that means, ask questions. Ask for help. If you find yourself struggling to keep organized, ask a well-organized coworker for some tips. If you are unsure of something, ASK! You might be right, but you'll feel better knowing you ran your thoughts past another set of ears. Your patients will be better off because of your prudence.
Don't be afraid to approach someone for help. Find the person on your shift who you feel comfortable with and just ask! I always tell new staff they can ask me anything, I don't mind. I'd rather you asked me and were right, then didn't ask and were wrong.
Don't be intimidated by doctors. They are human like us. Yes, they have a lot of responsibility, etc, but they are people. Say hello to them, learn their names, be visible. Whether they realize it or not, doctors always seem to listen more intently to a voice/face they recognize.
Do be prepared when you are calling doctors. Use a tool (SBAR) or write down what you want to say and have all pertinent information handy. Make sure your phone call is a necessary one (does he need to know now, or can it wait for tomorrow? -- and if you aren't sure, get a second opinion).
Set boundaries. Being sick or injured does not give patients the right to be rude to you. It's okay to say, "I don't appreciate the way you are speaking to me. I am here to help you, but you need to show me some respect/manners/etc."
You will get a lot of advice, and much of it will be useful. Sometimes people have gems of wisdom that will help you immensely. Don't be offended when you are offered "tips" or "suggestions" -- sometimes we do see you struggling and just want to help. Filter it all, take with you what works, and let the rest of it slide.
Be confident. Be prepared before you enter a room. If they ask you a question and you don't know, tell them you don't, but then find out.
Teamwork. However your work place is set up staff-wise, nobody wins when everyone works alone. Help out your coworkers and they will be more willing to help you.