You can watch a video of the one-handed cut in slow motion and real time here.
Tip: When learning the one-hand cut, separate the deck into two parts and hold the segments together using rubber bands. This allows you to learn the move without having to constantly pick up dropped cards. When you’re confident with the cut, remove the rubberbands and keep practicing. Also, when learning, you don’t have to use the entire deck. Simply use half of a deck or whatever amount is comfortable so you can learn the moves and grow accustomed to the clearances and such.
It probably helps to have a deck in your hand and follow along with the step-by-step instructions.
To perform the cut:
Hold the deck in your hand.
Note: Since I’m right-handed, I generally hold the deck with my left hand and deal cards with my right hand. As a result, I perform the one-handed cut in my left hand where I’m already holding the cards.