System Center 2012 Configuration Manager SP1 Upgrade Guide
Fellow MVP Jason Sandys has put together a really fantastic blog post on tips/tricks for upgrading to SP1. I highly recommend you read his post.
There has definitely been a lot of hoopla around Service Pack (SP) 1 for System Center 2012 Configuration Manager (ConfigMgr). From lots of failures actually caused by certain, over-zealous anti-virus/security products to the fact the SP1 adds a lot of new features. All in all SP1 is a massive upgrade that also includes many new features and subtle changes. It can go very badly if you don’t plan for it. Thus, here’s my comprehensive (at least as comprehensive as I think I can get) guide.
First, make sure you review the official KB and the documents linked there: 2801416.
The following steps are in a little bit of different order than listed in the KB but that’s because there is no hard dependency chain between some of them.