Layering your pudding:

Get a large baking dish and place an even layer of Nilla wafers to cover the bottom of the dish

Pour a layer of your pudding-like mixture as to cover the wafers

Peel the bananas and slice then into ½ inch cuts and place them in a layer over your pudding evenly, just as you did with the wafers

Repeat this process beginning again with the wafers until you have used all of your pudding mixture and there is a pattern of layers of wafers, pudding and banana slices

Make the layer on top your pudding mixture