Before replacing October CMS, inventory themes, plugins, components, RainLab dependencies, custom Laravel code, content models, media, users, permissions, queues, and scheduled jobs. Test an alternative with the most customized page and editorial operation rather than a blank demo. Compare extension quality, security response, upgrade paths, deployment, caching, localization, and developer workflow. Export content and URLs early to expose migration gaps. Maintain redirects, SEO metadata, and a tested rollback until the new system has survived production-like traffic.