• it is, typically, open-ended
  • there is not an obvious "correct" answer or end-point
  • you have more say in the direction the work takes
• it has a much longer time-frame
  • you need more self-discipline to get things done
  • you have more responsibility to plan your progress

If you're still in "assignment mode", break the task into 2-week-long steps and treat each one as an assignment (but, alas, no late penalty if you slack off).