I was very nervous too when i first started, but I had a wonderfully supportive doc that I worked for and a nice patient population with 2 great MA's. I was completely set up for success and yet every day still stressed me a little. You constantly see new things in primary care (at least I did) but knowing that you have support (a doctor who welcomes your questions and gives you support on whichever correct way you choose to treat a disease, an MA who is experienced, and a great online tool like UpToDate to reference while in the room with the patient) makes ALL the difference in the world. Wait for a job like that- seek that out even if you have to make some sacrifices for it because it preserves your sanity. I regret leaving that job SO much just because I wanted to live in a different part of the country and I can't find anything like it here.
I took a laptop in the room with me and while the pt was talking would look up (in UpToDate) anything i needed to know about what they were telling me. I spent so many hours in uptodate that UpToDate actually cut me off, thinking i was sharing my subscription- i had to call them to tell them, no I'm just new lol