1. No proper plan:

Yeah, planning is the most important step in everything you do. Career planning is the biggest deal as you should survive with the career for rest of your life, even if you can have a career shift. When you plan for a career change, you should definitely make strategy on how you are going to manage after quitting current job, especially in terms of finding a new feasible job, managing financial needs, learning new skills, further studies, so and so. Or else, your no planned strategy may place you again in a dilemma.

Check out here How to be Professional at Work