Identifying the obstacle

Whether you climb a mountain, sell commodities or play golf, there's always a major obstacle that stands in your way to success. We could call that your nemesis; you're not quite sure it's the problem although all your senses point to its direction and when you start thinking it's not, it begins rearing its ugly head again. Typically, a nemesis is an entanglement of contradictions; it seems omnipotent yet it is fundamentally weak, it might have good reason for its obstructionist power yet it really has none. It has just positioned itself into a perfectly protected cocoon that is both an armor and a hiding place. As a result, it grows bigger in our mind than reality as we fail to fully understanding it. We mythologize the beast instead of breaking it apart into weaker and winnable components. It's only when we start taking the obstacle for what it really is that its luster begins to pale off and it become assailable. If you can recognize “beasts” like the one I'm trying to describe, tell me how you can overcome them?