Yes! I rebuilt mine a couple years ago: a few lessons learned (Rig-Rite sells a rather pricey rebuild kit that comes with unfortunately scant instructions, which is problematic as the original bearings are no longer made and the kit is a re-engineering of sorts). Anyway, biggest thing: don't over-tighten the lock nuts. But the job really isn't that hard, it's a well designed system! I'd recommend also doing the bearings in the halyard swivel, too.
The job can be done (as indicated in post above) without unstepping mast. I did mine on the ground, but realized problems once the mast was up and rectified it aloft. Ooof.
Also, note: there are vast arrays of replacement bearings available on amazon/ebay, so if you aren't familiar with bearing specs find someone who is, learn, or buy the Rig-Rite kit! Just because a bearing is the right dimension, it doesn't mean they are strong enough to hold your mast up! I found write ups in other forums where people had bought $5 bearings from Amazon (with load ratings on par with fishing line).