Pick a spot in front of you to spot. You are going to want to focus on it throughout the whole trick. Pop and set side ways, you're permitted to swing your arm when you start out. Continue spotting and eventually after enough time goes by, you should come around and land miraculously on your feet.
Another thing you could do, is get a buddy or a coach to stand on the tramp with you, then cross their arms and you cross yours. Proceed to holding hands in this arm crossed position then as you bounce, think of uncrossing your arms.