Hopefully you can still open the hatch, if not, you may need to
remove the inside trim in order to release the hatch.

Once the hatch is open, remove the 3 allen head bolts (6mm I think)
on the bottom of the hatch and everything comes apart.

On hatches with flat buttons (84 and up?) you only need to remove the
1 allen head bolt to remove the entire lock assembly.  I think early
Vanagons you need to remove all 3.  No big deal, less than a minute
either way...