Sharepoint MOSS 2007 SP2 Upgrade from SP1- A very complex Farm

How to do upgrade MOSS 2007 SP2 Step-by-Step Guide----

Hope you would have already made the necessary preparations for MOSS2007 SP2 upgrade, this is just to make sure you have gone through the steps very well. Please read the following article & plan accordingly before we start the exercise.

http://technet.microsoft.com/en-us/library/cc263467(office.12).aspx

http://blogs.architectingconnectedsystems.com/blogs/cjg/archive/2009/05/10/How-to-upgrade-to-SharePoint-2007-SP2-_2D00_-Step-by-Step.aspx

I have followed the above article for upgrading my very-2 complicated farm with customozation & with multiple integration. Nothing broke after upgrade.