Upgrade Two Joomla Sites

I need both of my travel-related sites—baasreizen.nl and beyondthefun.com—migrated from Joomla 5.4.10 to the latest stable Joomla 6 release. I already hold full administrator rights, hosting control-panel access, and recent backups, so you can start immediately without waiting on credentials.

What matters most to me is that every existing page, menu, module, and core feature works exactly the same after the upgrade. Both sites run only standard Joomla extensions; no custom code or third-party booking gateways are in play, so a clean, core-centric migration path should be possible. Even so, I expect careful pre-upgrade backups, a test upgrade in a staging environment, and thorough functional checks before anything goes live. Zero data loss, zero broken links, and no front-end surprises are the measure of success.

Please confirm your Joomla 5→6 upgrade experience, outline your upgrade and testing flow, and give an estimated turnaround. Once we agree on timings, I’ll supply the server logins and backup archives so you can get started right away.