I'm going to recommend going to a turbo shop.
There'a a lot of controversy regarding slapping turbos together, in regards to the balance of the assembly. The actual assembly you could do yourself no problem - but the concern lines in the rotating bits. A turbo shop will dynamically balance the parts upon re-assembly so that everything spins true.
However, the other train of thought, is that all parts are balanced initially from the factory, so putting them together any which way will result in a balanced assembly. I've heard of people doing this and having no problem.
