1. Remap your "capslock" key to "escape." Vi was written using an ADM-3A terminal and its keyboard, which you can see here: https://catonmat.net/why-vim-uses-hjkl-as-arrow-keys has the escape-key in a sane place. On modern keyboards, if you can, remap "capslock" to "escape" when pressed alone, and "ctrl" when pressed with another key.
2. Make your leader key something easy like the comma character "," E.g. to make a horizontal split, I press (not including quotation marks) ",h" or ",v" to make a vertical one.
Once I did those two things it all made so much more sense... It's also great because most editors these days support vim bindings, so even if you don't want to use vim you can still benefit from its really-awsome-once-you-figure-it-out UX.