the first place to look is here
http://integramod.com/forum/portal.php?page=9 which is in the Manuals block on the left saying Safe Upgrade
This is great if you have CPanel, but the phpmyadmin comments are fairly standard.
A small note if you use the Backup and Restore database in ACP. Only use this if you have one site stored on that db. It seems to goof if you have more than one install wilth different db prefixes.
A