How to upgrade from 1.9 to 2.0?
- Backup your website.
- Upgrade and test it on a staging server (test environment with a copy of your current site for development purpose) if your hosting provider has this feature. You can work on a live site too, without staging, but at least create a backup. You are not going to loose any content or data, but it's always good to have backup.
- Fix issues and conflicts step by step on staging, we will help you if any problems.
- Push staging website live when all it's all sorted.