I am going back through the tutorial to double check all my coding, and I am confused by part 3: displaying entries. The first time I did this, I posted the code on my index.php page so it worked into my layout. But now I am reading about a single entry page and wondering if I am supposed to have 2 pages, like my index.php and then journal.php or something? Help!

Yes, you are meant to have two pages, one blog page (which shows all your entries) and one single entry page, which shows just one entry.