You should get a lot of "bombs" first since you will need a lot if you really wanna do it right. Best, get a higher place where you can actually test it.

- Equip the shield and activade it.
- Equip the bunch of bananas
- Throw the bunch of bananas 'near' to you. At the highest point of the arc, let the bananas go. You will get a push upward. Doing it in the right time you actually are able to fly away to secrets and like.