Yes. If there would be additional steps nescessary to install ispconfig they would have been listed in the tutorial.
But you should be aware that you can not run a real mail server on a dynamic IP as all majore emails servers like yahoo, hotmail etc. will block emails that come from a dynamic IP. The only workaround for this is to relay emails trogh a third party server with fixed IP, you wll find a tutorial for this here on howtoforge.