I got past the second page, but the 3rd page gave me an error of some sort. I have now dropped the database and trying to start over
if you got as far as you did then your doing ok with the dns thing. however, your error, without the specifics, sounds like you have not properly set the paths: $_CONF['path'] and $_CONF['path_html'].
Those are the most common problems going from the 2nd to the 3rd page. At least those were my problems on each of my 3 installs of GL. I think that if you looked at the errors for clues you would see something like "cant find file" or "not valid request on line so and so" or something like that.
hope my brain fart helps you