When I was a wedding florist, I used to get asked all the time about the best ways to preserve a bridal bouquet. More often than not I’d suggest taking it apart and either hanging it upside down to air dry it, or pressing each individual stem separately.
The latter option works beautifully with smaller and more slender flowers, but have you ever tried pressing a rose? Or any large bloom for that matter? It just doesn’t work. The heads are too big to fully flatten, and the first few times I attempted this for clients I would end up with a sad-looking brown mound of petals as a result. Not what you want to be showing a newly wed.
