By the seat of his pants
If you fly by the seat of your pants or do something by the seat of your pants, you use your instincts to tell you what to do in a new or difficult situation rather than following a plan or relying on equipment.Link
This will have to be a battle between instinct and logic. Most times, logic can fail. Plans made can be disrupted or move in an unexpected direction.
You cannot accurately plan the future, some features can go wrong. The information gathered might have some flaws, hereby affecting the result you get.
Then comes instinct. A subtle direction you get when in a tight spot, and most times it seems to be true. I don't think there is much explanation on instinct other than a feeling we get when we are lost and need direction.
It is advisable to follow your instinct anytime it comes calling because it does not come often.
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