Like all of our other dynamic-effort movements, the sumo deadlift should not be done with heavy weight. Use about 50-60 percent of your 1RM. Practice pulling with perfect form. Don't let your hips or your chest rise before the other. Engage your hamstrings, squeeze your glutes, and think about pulling the bar up by moving your hips, not extending your back.
If you're not accustomed to performing sumo deadlifts, do some extra practice before you hit the actual sets. It's not a difficult movement, but it can take a little practice to get right.