Ship 'em out to be done, it's just not worth the effort and purchase of
tools for the few times you'll ever do them. Getting the clearances
right requires special tools or multiple iterations of
assembling/disassembling to adjust the shim configuration, with a high
likelyhood that you'll damage something in that iterative process.

I had mine (63) done here some years ago: http://www.vansteel.com/

But strangely, I notice their website now only talks about '65 to '82
wheel bearing rebuilds... there are other reputable rebuilders, and
perhaps VanSteel can point you to someone who does the 63/64 bearings (I
don't think there's much difference, perhaps they are concerned about
damaging the arm or other 63/64 only parts that cannot be easily
replaced). Or, you could do a complete disk brake conversion while
you're at it (I'm not sure how you handle the emergency brake, though).

The rest of the bushings, etc are pretty straightforward, just follow
the instructions in the shop manual, being especially careful about
safeguarding yourself when dealing with the rear spring (ie, clamps and
chains for safety). Do the front differential mount bushings, too. If
you replace the front trailing arm bushings, that'll require you to buy
or make a tool (I made my own) to compress the assembled bushings so
that you can peen the replacement pivot tube to lock them in place. The
shock mounts are usually a bear to remove, requiring considerable
persuasion with a heavy hammer (or perhaps an air hammer would be useful
here), so one of those special nuts for that job (vansteel carries them)
may be helpful. As I recall, I just destroyed the old nuts by pounding
on them after loosening them ... I think I also used spacers to keep the
spindle holes aligned, and I reassembled using new shock mounts and
nuts, although the old mounts were probably reusable.

A rear end alignment will be needed when you've finished the job.