Around a year ago I had one of those huge migration tasks that you have no idea where to start. I hitted my head on the wall a few times, and had to erase first

Around a year ago I had one of those huge migration tasks that you have no idea where to start. I hitted my head on the wall a few times, and had to erase first month of work completely. In the end what worked was: 1. Spend a day or two creating a fuzzy view of the whole problem. Pay attention to the rabbit holes, do not fall in them, be superficial. 2. Spend a day or two creating a detailed view of the next 2 weeks. Go as deep as you can, but pay attention to not prepare more than 2 weeks of work, because things WILL change. And you will lose a lot of work. Minimize that. 3. Execute. 4. Repeat from 1. After a couple iterations your estimation will be much better and you will see the light in the end of the tunnnel. EDIT - almost forgot the most important part: write small backwards compatible prs that are deploy to production constantly. Don’t write few big PRs, they will bite your back.