It's a pain to initiate at first but once you get it you can do it everytime. My advice is to swipe from off the screen, ignoring the little bump on the edge of the phone, just swipe right by it like it's not even there and go all the way to the middle of the screen and come back in a swift, fluid motion. Don't do it insanely fast but pretty quick. You'll get it. I can do it everytime now and honestly without this feature I might not have the note 3 right now.
I sold my note 2 because I got sick of climbing up the side of the phone when I was trying to use it with one hand. With this new feature I'm going to start looking for an 8 inch phone LMAO