Join Date: Jun 2004
Bikes: 1987 Bianchi Campione
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The bearings are a minor press fit into the shell itself.
'Proper' way of doing it is to remove with something like the Park BBT-39 and then install using the bushings form that tool with the Park headset press. You can easily DIY a tool to do installation and removal. I'll leave that as an exercise to the reader.
Like kcycler said, there shouldn't be ANY regular maintenance on those bearings that require their removal and reinstallation. Once you remove them, they are effectively garbage and it's a replace. You replace them only when they are worn out. And that's easy to tell non adjustable, crank play and or roughness.