Set pudding aside, on counter or in fridge. Take bananas, peel and slice as thin or thick as you like. Sprinkle with lemon juice. Take out bowl with pudding and fold in Cool Whip (leave about 4 Tbsp. for top layer). Take deep bowl in which you wish to assemble pudding (any color; see-through looks best for presentation).
First, layer Nilla wafers. Second, layer bananas. Third, layer pudding. Continue layering to top of bowl. Top layer will be a thin layer of Cool Whip and some wafers placed in a design of your choosing!