1.So you download drupal to rolandallen(username of computer/Sites
2. Edit hosts file in /etc/hosts - add your new servername as before..
3. Edit httpd-vhosts located in /etc/apache2/extra/httpd-vhosts.conf - copy and paste as before
4. Restart apache by opening terminal and typing
sudo apachectl restart
4. Open sequel pro - create a database (add databse)
5. open firefox and type your servername you wrote in hosts file (eg hello.test).
6. you should see the drupal install profile.