Independent work

Not Doing Your Homework: Don't choose a career without taking the time to learn about it. In addition to a job description, you should make sure to gather information about typical job duties, educational requirements, earnings and job outlook.
Not Talking to Those in the Know: Your homework isn't complete if you skip talking to someone who currently works in the career field you are considering. Those who are engaged in an occupation can provide you with a truthful account of what it's really like to work in it. If possible talk to a few people to avoid individual biases.
Going for the Money, Honey: Bringing home a paycheck is important, but the size of it isn't actually a great predictor of job satisfaction. In other words, you can make six figures, but if you hate what you're doing, you'll find it hard to enjoy the fruits of your labour. Look for a balance between making enough money to support yourself and work that fulfills you.
Ignoring Who You Are: Your personality type, interests, values and aptitude make you better suited for some occupations than others. These traits are intrinsic, which means you can't change them. If you don't take them into account when selecting a career, there is an excellent chance you will wind up in an occupation that is unsuitable for you.
Not Considering Location, Location, Location: Jobs in certain occupations are concentrated in specific cities—Dublin or London for example—or in certain types of locations—such as cities versus rural areas. If you live somewhere that doesn't offer many opportunities in your field and you aren't willing to relocate, you will have trouble getting a job.

Conclusion
Not Looking Beyond a "Best Careers" List: Lists that tell you what careers have the best opportunities of the year, decade or whatever, can be a helpful guide when it comes to selecting a career. However, making a decision based solely on one of those lists is a terrible idea. Even an occupation with a great outlook can be a bad fit, so you have to scratch below the surface to find out whether you and a career are a good match.