Let me first apologize, I am completely new to video streaming and server management. I know enough to install php locally but the bus stops there :/

Your steps seem simple enough however I have a couple of questions regarding installation...
When you say
--Download my tuned version of mod_flvx or the original mod_flv by Paul Querna--
Do you mean open that file copy and paste it in a text editor and save it? If so, where should I save it on the server? Is their a directory I should be looking at?

--Install apxs tool (also avaliable in RPMs for most systems as httpd-devel)--
Does this tool come preinstalled on some machines? I am working on a mac and when I run "...$ httpd -l" I get the following
core.c
prefork.c
http_core.c
mod_so.c

--Compile and install your module with the following command:
apxs -c -i ./mod_flvx.c--
When I try to do this do I need to be in a certain directory? Same directory as the file I would assume?

The remainder is fairly straight forward. Any help is very much appreciated. Basically I don't want to know exactly "how" to do something, rather "what" I am doing and "why" it works the way it does.
Thanks a million!
-Kevin