It always took me six months to get use to a new job. The first week, the last 2-3 jobs I had, I got a horrible somatic stiff neck from the stress; not good when you're trying to work on a computer all day! But it eases, takes awhile. Meeting people and knowing you can do the job isn't all there is to it. I always had all sorts of only semi-conscious ideas and expectations for myself, wouldn't give myself as much time to learn the job (even though it "sounds" doable I've never done THAT job!) and get to know the people (only one of me so learning my name is easier than learning all of theirs) and stuff like that as the actual people I was working with would. It was funny because I was really good friends with the last women I worked with for 8 years and we were talking and were all saying how they thought I hated one of the women when we first met, that I really treated her mean. I don't remember that, I know I never really liked/trusted another of the women and even had ugly dreams about her but that was never mentioned!