Yep, it's good to be prepared, but to be honest, 99.99% of the times, nothin at all to worry about. Trouble is, you tend to focus on the process, rather than the outcome. (Not many fail).
Having said that, recently changed employer and had to attend a medical.
So worried, I nearly posted a thread on pprune!!
(I became very nervous when they came at me with a needle to test for Measles antibody-actually grabbed the nurses arm, filled up with tears and vowed never to tell anyone it was just a scratch again:-))
But hey needle phobics, it's just a scratch!!