PRS-T3 Library Usage with Reader

I have a T1 and a T3 but have never used the library functions. In fact I have never turned on WiFi. I sideloaded all my books and even sideloaded upgrades.

Could anyone give me some instructions about how to download books to the Reader? I have looked at the Wiki and the sticky about Digital Editions and I can't tell if I can download books directly to the Reader. The T3 wasn't sold in the US so maybe I have to use the T1.

I am trying to get this set up for my grand-daughter. Any help would be appreciated.

--MH