I've been using Vim as my primary editor (and vim mode in all my IDEs for something like 8 years)

In my opinion knowing what lots of keys do in a modal editor is not that different to learning all the shortcuts in say an IDE. I learned all the shortcuts to use Eclipse very quickly when I stopped using a mouse (I've never really liked using them and avoid them at all costs)

Pick a week where not getting a lot of typing out for time in won't hurt you.

Stop using other editors. You'll forge the necessary pathways to use it with the proficiency you have in other editors and then you can look up the 1% subset of the enormous features that will actually improve your workflow.