Here’s a great guide to using Sass with Chrome in your project. It also details how to install sass in the terminal, i’ve worked like this for a long time, but have just started using Scout (http://scout-app.io/). While the terminal works fine, Scout is a free, open-source app that works well and gives you some very easy ways of moving between development and production modes, plus handles multiple sites very easily.
You can easily set up chrome to enable discovering/editing your sass using developer tools, here’s a fantastic article on the subject:
One thing i’ve not got working yet is chrome auto reloading while doing this - if anyone has any hints let me know.