What I learned from a failed migration
It is easy to underestimate how much time preparation saves later. The short answer is that it depends, but the reasons are worth going through.
The result is not perfect, but it has worked well for over a year. Budget and time usually decide more than personal preference. Good materials and clear communication make the rest much easier. A simple checklist turned out to be more useful than any tool.
This came up several times this year, so it seemed worth writing down. The first step is always to look at what already exists. It is easy to underestimate how much time preparation saves later. Nothing here is new, but it is easy to forget when you are in a hurry.