Then, against the side of the bowl, place an alternating ring of banana slices and wafers, with the rounded side of the wafers and the flat side of the bananas pressed against the outside of the bowl to show through the glass. Press them into the pudding to help them stay upright.
Using a spoon, drizzle about half of the bourbon-and-apple-juice mixture over the wafers to moisten them slightly. Place the remaining banana slices that you've cut so far over the wafers.
Pour half of the remaining pudding over the bananas, and spread it as evenly as possible, making sure that some of the pudding reaches the edges of the bowl so it will show through the glass.
Spread about half of the whipped topping over the pudding layer, making sure that some of it reaches the edges of the bowl.
Place another layer of vanilla wafers over the whipped topping, and drizzle on remaining bourbon mixture. Peel and slice two more bananas. Place another alternating ring of banana slices and wafers around the outside edge of the bowl, as before. Scatter the remaining banana slices over the wafers, as before.
Pour the remaining pudding over the banana layer, spreading it as before, and then the remaining whipped topping, spreading it over the top of the trifle. Use a damp paper towel to clean any splatters from the rim of the trifle bowl. Peel and slice one banana. Place another alternating ring of banana slices and wafers around the edge of the bowl as a garnish, pressing the cookies about halfway into the whipped topping. (Do not peel the remaining banana. It will be used as a garnish.)