Sony Specific instructions
Before you begin:

1. Verify your Sony Reader has v1.1 or higher firmware installed.
2. Install Sony eBook Library software from http://ebookstore.sony.com/download/
3. Very important: While unplugged, turn on your Sony Reader. Let it boot up.
   
   
For Sony's and Nooks

4. Plug your eReader into your computer. Wait until the computer sees it.
5. Open up Adobe Digital Editions.
6. If you have not previously set up your Sony or Nook, Adobe Digital Editions will ask to register it using the same Adobe ID as your Digital Editions. See example below:
   
   
   
   
7. Once your device is authorized, you should see it in the Adobe Digital Editions screen, on the left under Bookshelves. Make sure you are looking at "Library View" (by clicking the icon of three books in the upper left corner of the screen). Your eReader should appear at the bottom of the list.
   
   Picture of Sony
   
   
   
   
   
   
   
   
   Picture of Nook
   
   
   
   
   
   
8. To transfer your eBook to your eReader, click on your previously downloaded eBooks and drag them to the eReader icon. The book will transfer.
9. Disconnect your Reader & unplug.

Sony
To find your new eBook, go to Books.

Nook
eBooks will appear on Nook readers in the "My Documents" category or the "My Library" section.