I don't do many audio books now, as I am not driving as much as I used to. Back when I was driving 60 miles each way to work, Audio books are what kept me from going insane! Now, I do mostly e-books, because if I sit down to listen to book, I tend to go to sleep and miss most of the book! We did a long drive in the toad recently, and really enjoyed a book that we listened to all the way.
As for using Overdrive from the library, it is very simple to use. I get books on my two NOOKs, my smartphone, and my desktop occasionally. Wireless Download to a nook, tablet, or smartphone is just a mouse click or screen tap. And they download very fast!