I could be wrong, but I think the original questions show a very J way of viewing the world. I am incredibly strong-willed and stubborn (two slightly different things), but planning doesn't really factor into it for me (beyond the unavoidable, like having to schedule an appointment or something).
When I am set on something, nothing can keep me from eventually achieving my dream. As a P-type, those dreams tend to be ongoing type things and paths to follow as opposed to end goals. If anything, the "goals" are far more beginning points than ends in themselves. For instance:
1. To find my father, who I had never met, and form a relationship with him as an adult. (Bonus: I found out I had siblings!)
2. To become recognized as a knight in some system that I feel forces me to grow as a person into the closest approximation of my personal heroes as reasonably possible.
3. To have a job I enjoy, that allows me to express myself the way I wish to be percieved, and also makes the world a better place.
I have never wavered in these three. I like things to be open-ended, and I dislike conclusions, endings, or concrete goals because finishing them feels like I've lost having something to strive for. But I find myself constantly thinking about what I want to do better to maximize my dreams. It doesn't feel like effort in the sense of hard work. It feels more like constant enthusiasm and hopefulness with occasional bouts of angry frustration when things go wrong. But the anger is good, because it helps me power through the rough patches until things are better again. This is where my stubborness comes in, because if things are bad for too long, I start to get bullheaded about not changing course because I think that would be the same as giving up. This can be detrimental if I get tunnel-vision, as I can actually be so stubborn as to make things worse. So I have friends reminding me to take a step back and think about how my actions are forwarding my cause (or not, as is often the case) quite often.
Oh, and as for the long-term, those dreams I listed are my big three, which I set for myself at age 12. I'm now 30. I also can be rather strong-willed when it comes to my value system, but since I believe a good value system changes and grows with the individual, that is somewhat harder to demonstrate. My value system now is not the one I had at 12. While it shares some things, enough has changed that I'm sure many outside observers would think I had no tenacity at all.