1/2 way through Don Quixote

I am reading Don Quixote and once again we have mention of Cervantes play in discussion between a priest and a canon. I am thinking am I confused about this book, maybe there are two stories in this book and not just Don Quixote, as on pages 458 to 461 we have valedictory poems about Don Quixote, Sancho and Dulcineae. But as I finish reading the poem on page 461, I come across the words: End of the First Part. This means that there is a tease from this supposed author of this tale when he says that all he could find nothing about Don Quixote when he returned home this second time except the above mentioned tributes found in a box. Apparently, he has found more or am I supposed to think we have a different author. Anyway, not done yet only 479 more pages to go. I have decided to forgo any readings until I have conquered this book. Hopefully, I will not run into any knights errant or enchantments that will make me stop reading.