I recently took in a freelancing project, and one particularly interesting task is to convert unstructured-ish DOCX files to structured data, let’s say JSON. Intially, I estimated that it should only take me around 2 days for the implementation. I know what are you thinking. You are right that: […] overconfidence is a slow and insidious killer. 1 In the end, the task took me more than 5 days to complete.