You have all the time to rearrange or polish your flower arrangement. The flower design should look beautiful and artistic enough before you place your filler, when the filler is already placed, it would be harder to move your things around the area or place. Bear in mind that The filler are very fragile.
My love for nature, and particularly flowers, manifested itself from an early age. When I was in elementary school, I remember frequently picking up flowers from our garden in the morning, wrapping them in a newspaper and taking them to school, where I would use them to decorate our classroom. This was something that I did spontaneously, and it gave me so much joy!