README.md: Don't assume the user has downloaded Factor yet. Instructions on how to...

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 ## Getting Started
 
-If you are reading this README file, you either downloaded a binary
-package, or checked out Factor sources from the GIT repository.
-
 * [Learning Factor](http://concatenative.org/wiki/view/Factor/Learning)
 * [System requirements](http://concatenative.org/wiki/view/Factor/Requirements)
-* [Building Factor from source](http://concatenative.org/wiki/view/Factor/Building%20Factor) (don't do this if you're using a binary package)
 
-To run Factor:
+### Building Factor from source
+
+If you have a build environment set up, then you can build Factor from git.
+These scripts will attempt to compile the Factor binary and bootstrap from
+a boot image stored on factorcode.org.
+
+To check out Factor:
+
+* git clone git://factorcode.org/git/factor.git
+* cd factor
+
+To build the latest complete Factor system from git:
+
+* Windows: build-support\factor.cmd
+* Unix: ./build-support/factor.sh update
+
+Now you should have a complete Factor system ready to run.
+
+[More information on building factor](http://concatenative.org/wiki/view/Factor/Building%20Factor)
+
+### To run a Factor binary:
+
+You can download a Factor binary from the grid on [http://factorcode.org](http://factorcode.org).
+The nightly builds are usually a better experience than the point releases.
 
 * Windows: Double-click `factor.exe`, or run `.\factor.com` in a command prompt
 * Mac OS X: Double-click `Factor.app` or run `open Factor.app` in a Terminal
 * Unix: Run `./factor` in a shell
 
+### Learning Factor
+
 A tutorial is available that can be accessed from the Factor environment:
 
 ```factor