The procedure is actually not that difficult. You just need to work carefully to prevent scratching up the dash pieces.
Probably the most difficult part is sliding the radio and cage back into the dash, since the wires tend to try to block the way.
Correct link is:
http://www.geocities.com/svxdc/AudioInstall.htm
(URLs on Geocities are case-dependent, unfortunately. The link that subarufamily posted goes to a page that redirects to the correct one).
I'll be happy to answer any questions.
Added: Oh, and congratulations on your "new" SVX, and welcome to the site!
You can find a wealth of useful info in the "How-To Documents" section. See the link at the top of every page here.
You can find many other topics and FAQs (which haven't been written up into a How-To doc yet) by searching the forums.