Last week, I saw a demo of the new Self-Service Reporting feature in Aras Innovator. We want to begin to play around with this feature, so I upgraded our demo server from version 11.0 SP2 to SP3.
The documentation included in the SP3 CD Image is excellent. I don't have anything to add to the documentation, simply follow the 8 pages of instructions step-by-step to succeed. You should allocate about 2 hours for this upgrade - it's more involved than the previous upgrades to SP1 and SP2. It requires configuration of a Reporting application server in IIS and an XML configuration for each database on your server.