Here is a goal: Use a piping bag

How would you accomplish this goal?
Screw the tip into the coupler tightly. Prepare the bag for filling: Grasp the middle of the piping bag with one hand. Fold the top half of the bag over your hand to open up the bag and form a cuff covering your hand. Fill the bag: Scoop up your filling with a rubber spatula, or spoon and insert it in the bag