So while you are there staring at your navel, trying to come up with a plan in the complete absence of any knowledge of the world, some other guy is fascinated by a smoking stump left over from a lightning strike and screwing around with it a bit discovers fire.

Science is a human activity that arose from human activity and stayed around and was refined because it filled human needs. Scientific method did not arise from a plan it arose from contemplation of piles of facts. Chemistry and physics arose from different contemplations of different piles of facts.

You need to look at the world full of bricks and facts to have some idea how you are going to go about triage, you don't figure out how to triage facts until you know a bunch.