The important thing is just forget about everything else and what everyone else is doing.
Define the problem clearly
Break the problem down into smaller parts.
List your assumptions and consider that each of those assumptions is wrong, or ask – which of these are we sure are true?
Look at the goal and consider the actual science.
This is an article that explains it in more detail
https://medium.com/mental-models-product/mental-models-product-2-first-principles-thinking-57ece8d3c82b
