Wear a shirt that fits close to the body. This is especially important for female dancers since the upside down movement will cause the shirt to fly up. If you don't have a tight-fitting shirt, tuck your shirt into your pants instead.
Find a stable dance floor to practice on. While you're learning, a soft surface such as grass is better than concrete or wood flooring.
Spend at least 10 minutes stretching before you dance. This might seem trivial, but it's absolutely necessary to help avoid injury.
Extend your arms straight upward and flex your fingers as if you're holding a plate of food above your head. Then bend and the waist, touch your hands to the ground, and kick your feet upward into a handstand. This requires extreme balance and strength so don't worry if it takes you more than a day or a few weeks until you're comfortable in a handstand. Until you can get into and out of the handstand easily, you won't be able to perform the scissors.
Move your legs in a scissors-like motion while you hold yourself up in the handstand. To do this, move one leg forward and the other leg backward and then switch back and forth continuously. Your legs can be slightly bent if it helps you balance, so long as you don't come out of the handstand.
Walk forward on your hands as you scissor-kick your legs. This is the final portion of the move and it will allow you to travel across the dance floor. Come out of the move after your body becomes fatigued by stepping one foot down and then the other. You should never slam your legs or knees into the ground, so practice finishing the scissors with grace.