As in all the disciplines, the most important 'tool' is the experience, and that - ça va sans dire - needs time. That said, I think the best advice I can sugge

As in all the disciplines, the most important 'tool' is the experience, and that - ça va sans dire - needs time. That said, I think the best advice I can suggest is Divide et impera, https://en.wikipedia.org/wiki/Divide_and_conquer_algorithm https://en.wikipedia.org/wiki/Divide_and_conquer_algorithm