Very easy and very good. You have to be careful when buying lemon cake mixes, some are good, some have a funny chemical taste from the artificial flavor. I also put the cake layers in the fridge and got them cold before attempting to assemble. Make the pudding according to these directions, not the box. Has to be thick, you might even wait a little for the pudding to thicken before spreading. Thaw the cool whip, I had no problems.