Realistic vs thinking big

Hi, I’m a new scholar and just enjoyed your “behind the scenes” vid for February. In it, you referred to someone who had a goal of paying off $100K in student loans within 3 months. You acknowledged that it wasn’t a realistic goal. Can you talk about how to know for yourself if a BIG goal is realistic or if you’ve taken thinking big a little too far? I obviously want to do the model work on my thoughts that tell me my goals are ridiculous or unrealistic, but there’s always that voice in the back of my head saying… “but what if they ARE unrealistic?”

HOW do you know?