I usually work, then do `jj split` to review changes I want to make commits to. This generally makes the workflow look like `git add -p`.

A decent mental model is that the top-most commit isn't generally going to get pushed up anywhere. It's like your working copy but also you get stashing "for free" (change back to main to make a new commit? All the WIP stuff stays on that branch instead of being carried over to main!)