In this video, I walk through
generator-bootstrap - an uber-simple Yeoman generator which prompts you for the flavour of Twitter Bootstrap you would like to install for a project: CSS only, Sass, Less or Stylus. It's a nice time-saver.
You can of course just manually lookup or install the flavour of Bootstrap you would like from Bower directly. As I find myself needing to switch between preprocessors depending on project I thought others may also find this useful.
Install and run:
npm install -g generator-bootstrap yo bootstrap