[astrofinch]

It's good to be thinking about what the right thing to be working on is. It's bad to feel the emotion of fear as you're doing this, because fear triggers your evolved instinct to stop giving your cerebral cortex cognitive resources and get the hell away from whatever is making you afraid. (If there's a car or wildebeest coming at you contemplating it in depth is not going to help you survive and reproduce.)

Playing strategic computer games like Civilization is a good way to convince yourself that you can make decisions about complicated stuff without feeling the emotion of fear.