I have been working with this BI stack since before the 2000 version (even though it didn't really get pulled together until the 2000 version). Because of this, I have been steadily picking up more exposure to and experience with the parts of the stack as they were introduced and evolved; and, I was in a position to be able to build solutions with the stack all along the way. Since that may not be your background with this tool, I would highly recommend getting some training before diving into a big project built with Microsoft BI. You will want training in: (1) a data modeling methodology for multi-dimensional data (i.e. Kimball method) so you can use Analysis Services, (2) Analysis Services itself, and (3) Integration Services. SQL Server and Reporting Services are a little easier for the average developer to pick up (in my experience). But if you can, get the whole end-to-end integrated training from Pragmatic Works and you'll be building complete solutions much more quickly than you expected.