Very easy and delicious, instructions arent' very clear so I ended up using the rest of the cool whip for the top layer. I was pretty sure that's what you were supposed to do anyways, but it didn't really say. Also, the cream cheese layer tends to stick to the blueberry jello layer so I reccomend blending it just before you put it on to make it smoother.
<<< Response from Kraft Kitchens Expert, Mary ~ Thank you for pointing out the omission in the recipe. Yes, the step to spread the top of the cake with the remaining Cool Whip was left out. We will be adding it to the recipe. >>>