“Just start” is the generic advice you usually hear from someone trying to help a procrastinator. Another: “break it into smaller pieces.” Seems logical, but not very interesting.
In my personal experience, the best advice is: “make it fun.”
No matter your age, your mind still wants to have a good time. The best products are by-products of someone having good time—enjoying the process. So change the setting, spend some money, or just goof-off until something begins to materialize. Why not?