Night before: Remove the shrimp from the package and place it in a container with a cover in the refrigerator. The shrimp will be ready in 12 hours (once they are thawed, use them within 48 hours.
Day of: Remove the shrimp from the package and place them in a large bowl of very cold water for 15 minutes, stirring every 5 minutes to break up clumps that freeze together. The shrimp should be defrosted in about 15 to 20 minutes, depending on the size of the shrimp.