I struggle with this also. I think it is a big part of why I don't want to stay at any company for more than a few years and why I am so burnt out on IT. I try to look at how anxious other people in the organization are. Usually, I'm more worried than anyone else. If management doesn't lose sleep over it, why should I? Telling myself stuff like this is easier than actually believing it, though.

I once had a job testing that really didn't work for me. I was not given enough time to test but I was also blamed when bugs were found in production. Is that the kind of environment you are working in or are people generally eager to help solve problems when they pop up?

How do you handle things when it doesn't go well, that 1% of the time? I have had people comment on how cool and calm I seem, which totally confuses me because I feel very anxious (but focused) inside. Remembering that I have handled challenging, time-sensitive situations in the past reminds me that I can cope with them in the future also...