The one habit of the 7-1/2 lifelong learning habits that I find to be the hardest for me is setting a goal and formulating a plan to achieve it. I too often start with a vague idea of what I would like to achieve. Formulating an effective, efficient, long-range plan then becomes difficult. On the positive side, it does give me a chance to really think about what it is that I want to do, examining the idea from all sides.
The habit I find the easiest is viewing problems as challenges. I love the intellectual challenge that problems pose. I know the answer is out there, I just need to examine the problem from every angle and sometimes inside out to find it.