You will miss the mark every time if you don't pay attention to details. You can have the desire, you can have the right attitude, you can have the talent, however, if you don't pay attention to detail, you will not be successful, you'll be frustrated. It is because you are not learning the fundamentals. You are not paying attention to the little things that will build a foundation to guarantee your success. You must learn how to shoot a proper jump-layup before you can move further away from the basket.
Success breeds success.
If you learn the proper mechanics and master them at an easy range, you can apply the same mechanics as you step further away from the target. The key to success here is to master one step before you take the next step. Great outside shooters master one step at a time. A Math Teacher can help a student rebuild his fundamentals the same way, by returning to the first step, and rebuilding the fundamentals, and testing the student until he is ready for the next step. Soon he will be ready to fly on his own.