Documentation for how to use audodoc is missing important parts

For someone new to sphinx going through the simple setup is quite difficult and confusing to figure out how to use autodoc:

what is autodoc? an extension? a module? a command?
how to install the autodoc?
how to set the source code path with sys.path.insert(0, os.path.abspath('.')) ?
a working example of setting up autodoc complete with everything, not just incomplete bits and pieces

ericholscher / sphinx-tutorial