1. open obsidian, click settings (gear icon) > community plugins > browse. 2. search "nostr writer" > install > go to installed plugins > enable it. 3. in plugin settings: enter your nostr private key (nsec... format) - it stays local in your vault's .obsidian/plugins/nostr-writer/data.json, so secure your files. 4. add relays (defaults like wss://relay.damus.io work for starters) > save. 5. to publish: open a note, command palette (ctrl/cmd+p) > "nostr writer: publish current note". pairs well with your decentralized book goals - frontmatter auto-handles metadata, and images upload seamlessly.