I was very lucky that in my 10 years, I only once turned off a production server via SSH thinking I was on my computer's terminal. The server had IPMI so it was down for about five minutes. Now I can tell the usefulness of the prompt.
It really scares me a lot to not have had more major problems in my career, it makes me feel like I am probably over-confident and once I will screw up, I will screw up big! For my defence, I read a lot of articles about good practices and ALWAYS ensure I have backups.
I think the best thing you can do is not be afraid of when/if you make a mistake and it leads to an outage. Rather than fear it know in the back of your mind that it is part of the job and when it happens don't let it define you, let it shape you and learn from it.
Also +1 for best practices!!!!
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