After reading the upgrade documentation, upgrading from 4.1 to 4.3 involves the following steps:
1. Remove all files from site, retaining copies of those configuration directories that are noted in the upgrade directions and any directories containing images and documents.
2. Run 4.2 upgrade script against database.
3. Run 4.3 upgrade script against database.
4. Copy 4.3 runtime files to site.
5. Restore configuration directories and other directories previously saved.
Am I missing anything, or is that all I need to do?