n00b - question about using SSI

hello hello,
so i am trying to set up my local webserver to allow ssi, as I am
testing a site i am building which uses quite a bit of ssi. I want the
files to have a .inc extension. I did a bit of research on my own, but
most of the stuff I found is really not meant for people with little
(or NO) apache knowledge (like me!). So, I added the following to the
bottom of my httpd.conf file:

LoadModule includes_module

<Directory /Library/WebServer/Documents>
Options +Includes
AddType text/html .inc
AddHandler server-parsed .inc
</Document>

How's that? Am I close? Anyway, as im sure some of you already can
guess, when I then try to start Personal Web Sharing, I get a message
that it is starting up, and it never does. If anyone could tell me what
I'm doing wrong it would be most appreciated. Oh, and one more quick
question: does allowing ssi in the Library/WebServer/Documents/
directory allow all child directories to use ssi? or would I have to
specifically allow those also?

thanks so much