Okay, all of the above and . . . here's kind of the zen of it all . . . you don't want to try too hard! For if you try too hard, you'll likely to both make yourself nervous and other people nervous as well. Now, I typically do try too hard at the beginning of a new job, but I'm also in the process of learning skills for graciously backing off.
It's very much a matter of a steady B game, and not an occasionally A game.
And frankly, even if you go on to medical school and become a doctor, a lot of that is still a matter of a steady B game!
For example, in Melvin Konner's excellent book BECOMING A DOCTOR (1992), towards the beginning he listed:
1) If something is working, keep doing it.
2) If something's not working, stop doing it
.
.
.
That is, in a credible way, medicine is much more trial and error than people might think. So, it's important not to become married to what you first think is going on with a patient, but instead be willing to adjust as you go along.
----------------------
So, learn a lot. You will make mistakes, it's all part of the human condition, just try to let your medium mistakes remain medium mistakes, and be open to appreciating people for the quirky, unpredictable, amazing beings they are (well, sometimes amazing let's say, sometimes they're just there)
All the best. And please drop us a line from time to time.