It seems to me that Canon tries to make it's software fool proof. But it seems in their efforts they make it so only a fool can use it. I think you just need to play around with Easy Photo Print EX and you will eventually understand their thought process.
If you use PS, that I am sure you can master EPP EX.
A few tips, you must select your imagaes first. They show up in the space below the project. When you click on the image there will be the little adjustment squares. Just click and move them where you want the picture and what size you want it. Just like Free Transform in PS.
Also, hover over the little Edit tabs and a pop-up will tell you what it does.
It is pretty "easy" when you get on to it.
