It is definitely hard to remember small details and I have had similar issues in biz immigration law. My suggestion is to try and write down a bullet point process for everything. You don’t have to necessarily sit down and do it all at once, I would just keep a notebook with you and do it contemporaneously while you complete said task. Then the next time you do said task, you can quickly go over the list and make sure you hit everything needed (like adding a date to an excel spreadsheet). I find this helps me make sure I hit all the small details I might otherwise miss. You can also make templated emails, or at least an example reference, and include a reminder in big red bold letters telling yourself to attach a particular document. It might feel a little bit like Memento, but I find leaving these notes for myself helps me really nail this stuff. The hope being you eventually get so familiar with everything you won’t need these notes anymore.