I think it is natural to have some anxiety about anticipating new challenges. It is not clear from your post how long your orientation period is, or how much nursing experience you had prior to going to the OR, so I will respond as best I can.
Over 30 years ago, I was 'baptized by fire' in the OR; I had no real organized orientation plan, and surgeons were not nice. I was put on my own very early on without any clue as to what I was doing. It took me about one year to become comfortable with the basics, and about another 2-3 to become much more proficient in understanding all the intricacies of various surgical procedures. In addition to this, technology changes rapidly and so the learning continues. I have a broad base of knowledge regarding procedures commonly done many years ago as well as knowledge of the newer, endoscopic procedures done today. There were many days I wanted to leave and not return; it was stressfull and I felt stupid and useless. Like many things in life, there is a learning curve with perioperative nursing.
Having said this, I learned to prioritize by working with older OR nurses who based their practice on AORN standards and recommended practices while adhering to hospital guidelines. It helped tremendously to be paired with a very experienced surgical scrub tech for cases.
It helped tremendouly to understand what the surgeon was doing; anticipating what the surgical team needs BEFORE they need it is essential to facilitating a case. I bought "Alexander's Care of the Pateint in Surgery" as well as "Comprehensive Perioperative Nursing" by Gruendemann & Fernsebner to help with the learning. I joined AORN soon after going to the OR and I read the AORN journal every month.
Prioritizing is essential in the OR. to do this, I think about:
1) Pt safety and privacy - what do I need to do to provide a safe environment from the time I set up the room until I transfer to patient to PACU.
2) Collaboration - check with the surgeon and anesthesia about positioning if this is a concern, as well any extras he may need for the case.
3) Aseptic technique - how will I accomplish this before and during the procedure.
4) Anticipitation -knowing what the surgeon is planning to do along with his preferences (sutures/implants/cautery settings) will help you be ready. This will come in time, and preparing for you assigments by familiarizing yourself with procedures prior to doing them will help.
5) organization -after 30 years, and 4 different facilities, I still keep a notebook and jot down any information intergal to facilitating cases. In addition, keeping your room 'uncluttered' i.e., keep the floor clean so you don't trip over cords, trash, extra unnecessary furniture strew about. Line up drains, sutures,dressings, etc so they will be ready when your scrub asks for them.
6)Working knowlege of equipment - know what equipment you will use for a case, know how to troubleshoot it, and know who to ask for help in the event you have a problem with it intraoperatively.
As for the soft-spoken docs or the mumblers, I go right up behind them to ask a question or hear their response.
The scariest nurses and techs I ever worked with are those that think they know what they are doing - they did not know what they didn't know -if you get my drift. instead of asking, they charged forward, often making mistakes and aggravating the surgeon to no end. So, be open to suggestions, read up on procedures prior to circulating them, and ask if you don't know. Your confidence will come in time; you will become more assertive as you develop some proficiency in perioperative nursing.