This screencast demonstrates how to handle large changes in the working copy using jj-fzf. It begins by splitting individual files into separate commits (Alt+F), then interactively splits (Alt+I) a longer diff into smaller commits. Diffs can also be edited using the diffedit command (Alt+E) to select specific hunks. Throughout, commit messages are updated with the describe command (Ctrl+D), and all changes can be undone step by step using Alt+Z.