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Indifference to education
2. Indifference to acquiring new skills
IT changes all the time. Without the desire to continue learning, you're already at a major disadvantage. Tech is one of those fields where you must be always up for acquiring new knowledge. That might mean attending a class or workshop, or just hitting the books on your own. Regardless of the approach, in the end you must be willing to continue learning.
Working at night
3. Nine-to-five mentality
Technology doesn't always stick to a schedule. Servers go down at inopportune moments and yet business must continue. So you must be willing to wake up in the middle of the night, work long hours during the week and weekends. If you're someone who refuses to let work interfere with your personal life, the writing is on the wall.
Two workers fighting
4. Dislike of people
The whole purpose of many IT jobs is to support end users — aka people. If you don't like people — and I've encountered plenty who don't — you really shouldn't consider a career in IT. Sadly, I know number of colleagues who have been driven to dislike people precisely because of their experiences working in IT.