Once the Drupal 8 branch has completed downloading to your machine, which can take several minutes, you will be able to pull up the Drupal installer in your browser at http://development/drupal8.

Go through the standard drupal install up to the Database configuration screen:

Once you get to the Database configuration screen, open a new tab in your browser.
(Note: it may seem like a dance back and forth between the two tabs in the next several steps. The reason is that these steps minimize the chances of messing up. If I have a copy-paste failure following this procedure, I have not lost anything. Whenever I try to shortcut, I will inevitably lose the password I saved to the clipboard.)