current Gulp configuration

gulpfile.js

var gulp 	 = require('gulp'),
    sass 	 = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss 	 = require('gulp-minify-css'),
    livereload 	 = require('gulp-livereload');

gulp.task('styles', function(){
	return sass('scss/') 
		.on('error', function (err) {
			console.error('Error!', err.message);
		})
		.pipe(gulp.dest(''))
		.pipe(autoprefixer())
		.pipe(minifycss())
		.pipe(gulp.dest(''))
		.pipe(livereload());
});

gulp.task('default',['styles']);

gulp.task('watch', function() {
	
	livereload.listen();
	
	// Watch .scss files
	gulp.watch('scss/*.scss', ['styles']);
	gulp.watch('scss/**/*.scss', ['styles']);

});

package.json

{
	"repository": {
		"type": "git",
		"url": "https://github.com/zoerooney/Emi"
	},
	"dependencies": {
		"gulp": "*",
		"gulp-ruby-sass": "*",
		"gulp-autoprefixer": "*",
		"gulp-minify-css": "*",
		"gulp-livereload": "*"
	}
}

To run the default task, make sure you're in the project directory in your command line tool and type gulp

To run the watch task, type gulp watch

You will get errors if you have any missing stuff, like missing npm modules or if you don't have Sass installed (or if you don't have gulp installed).

I usually have two Terminal instances running, one for the watch task and another for manual stuff like git commands