Question about creating goals?

I have decided that i am going to get what i want out of life, and most of the things i want are pretty outrageous. But i was thinking, that though unrealistic goals are created, if you create a plan to achieve that goal, and you work at it, and continually adjust what you need to do to achieve that goal, it doesn't matter how big it is, as long as you have a plan that you can honestly believe in, it can be achieved. Would you agree with that?