Joomla itself updates smoothly from 2.5 to 3. The main issues occur with extensions or templates that haven't been adapted for Joomla 3. Watch these videos, and you should be ready to migrate.
Video #1. Introduction to the migration
In this video, you'll learn about the approach we recommend. Rod talks about the extra information available on this Joomla Docs page. He also mentions the "How to Migrate Joomla 1.5 to 3" class that is available in Joomlashack University.
Video #2. Planning and checking extensions
In this video, we recommend that you use a test site for this migration. Akeeba Backup is an extension that makes it easy to create a backup of your site and there's an Akeeba Backup tutorial here. Once that's done, check all your installed extensions to make sure they are ready for Joomla 3. It's also important to check whether your server meets the technical requirements for running Joomla 3.
Video #3. Updating your template
The next step in upgrading to Joomla 3 is checking your template. Even if your template is ready for Joomla 3, you will need to take a couple of steps. You will need to uninstall the Joomla 2.5 version and then install the Joomla 3 version after the migration is complete.
Video #4. Performing the migration
In this video, you’ll actually perform the migration. Joomla 2.5 has a built-in component to perform the migration. You will go to Components > Joomla Update and change the update option to “Short Term Support”. Then, click “Install the update” to complete the process.
Video #5. Clean up after the migration
In the final part of the migration process, you'll bring your site back online after the update. This involves testing your site, removing any old Joomla 2.5 templates, and installing your new Joomla 3 template. In this video, Rod uses the Breeze theme from OSTraining.
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