The shift will be smaller than you might at first think . . .
I believe that in general . . . shoot for 1 unit of displacement for every
30 units of distance to the target.  If your camera is 30 from the wall,
shift the camera 1 unit to the right.
  Then paste the results side by side.  These are often difficult to view
on a monitor (crossed-eyes method) and the wider the pic, the more
difficult it will be for folks to see.  Any shift > 3 inches on your monitor
will be difficult or impossible for most folks to see.  Prints offer you a
little more latitude.
  I would just simulate your scene and set up a few simple objects at those
distances and experiment.  It's a great effect if you can get it right . . .
and, as I said, the most common mistake . . . even with a camera, is to
shift too far.  The brain (where depth perception lives) can't make sense
of the data.
--
Y

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