I would follow the instructions except the sync stage. Better to drag the book from the iTune lib to the device. No need to sync. syncing the iTune lib is calling for later Trouble.It's even easier than sending via email - just drag it into iTunes in the bookshelf. More... Manually Install eBooks to iBooks for iPad®
Cool, I was looking for a good PDF app too.What is large? Can it fit into internal storage?
For now I think Bluefire is best for PDF's