NANs are like zombies. Do any operation with a NAN and it becomes a NAN.
Focus on your focus. If you focus on what you fear, that will come true. Every step, every move, is a decision. Each roadblock is going to require you to first and foremost readjust your mindset. You have to decide and work hard to maintain the same attitude and mentality in each and everyone of your decisions. Every level has its own devil you will need to fight.