They make a tool that helps with pressing the races in, it has a tapered piece that fits inside the race so it doesn't get messed up. I've never used a press to install races, they're not that tight of a fit. The correct tool, and a few hammer taps is all it takes.
10 Piece Bearing Race and Seal Driver Set
There's Harbor Freight's version for a reference.
And Auto Zone's website says they loan them out.
