Many times the barriers are not on the outside but on ourselves.
The goal may be difficult but if you take care your inner language it will be more affordable. With motivating thoughts such as "I'm going to make it," the goal looks closer.
Neurolinguistic Programming (NLP), one of the newest branches of psychology and which is giving such good results, has a lot to do with inner language. In fact, NLP is widely used by the great motivator Anthony Robbins.
This image on the left sums up very well the kind of internal thoughts that we can have in relation to the achievement of a goal. No matter how difficult the goal is never put obstacles in your own way.
Plan, break down that great goal into smaller goals and above all, be self-motivated with your inner language. The more difficult the objective is, the more satisfaction it will provide you to achieve it.