I've never "done" mine, any lube or service whatsoever.  And now 220,000 miles.  I don't have the tools or space or knowhow to attempt this job myself.  The mechanic recommended (and he is a very knowledgeable guy) that instead of replacing rear wheel bearings, that he should inspect first.
Reason:  new stuff is not at good as old stuff.  He said new stuff just doesn't last.  I'm inclined to agree.

He recommends inspection first, re-packing with grease second, but if bearings are No Good after inspection, then replace....at least with the best available.
So....Anybody got some insight on those rear wheel bearings?  I know the "manual" says they are lifetime, but they didn't think we'd be wanting those bearings to last 40-50 years!!  And that's what I want them to do.

RichSan Diego