The writing of a paper (or the dissertation itself) is often a long process, along which many decisions are made: should I send my ideas for feedback now, or generate more polished text? should I think of the target journal now or decide once I have the finished draft? et cetera. To finish this mini-series of posts on writing (why writing papers is hard, how I write papers, and the second part of that writing process), I review here the main principles and lessons that I have learned after more than 10 years of writing scientific papers. I hope they help you navigate these decisions if you are in doubt, or if you have to step out of the usual writing process due to unexpected events.