i think you should de-couple the 2 tasks. it's a good thing to
learn how to do, the virtual walk-through, but, why tie it
to the selling of your house ? pictures work great.
Autodesk has a very good full-function demo of 3D studio
max 8, on their website.
a year ago, it was revision 7, and then they were also
giving away the tutorials, which are superb.
incidentally, the tutorials, which consist of a big tutorial
program, have a whole bunch of example files. you open
up the sample file when you do the tutorial.
one whole chapter of the files is on a walk-through of
a house.
it takes time to learn ... it's good to learn. i say, take
a WHOLE BUNCH of pictures, pick the best ones, put
them online. get, hopefully, a good price for your house.
find a friend who is eligible for the educational software
discount. i'll stop there.