Professional florist supplies always include a variety of cutting tools, including knives, pruners, bunch cutters, flower scissors and more.
These tools are especially designed for use with fresh flowers and professional florists tend to jealously guard their tools to protect them from damage.
Using the wrong tools (such as household scissors) can damage flower stems by crushing the stem cell structure, making it hard for the flower to take up water to the blossom head.
I've seen inexperienced designers hurt themselves by trying to cut slippery (and hard!) stems with scissors. The extra force needed can actually result in cutting off a finger tip! (Trust me . . . this is not fiction!)
Take a few minutes to learn how to correctly hold and use a floral knife - both for safety reasons and in order to avoid damaging your expensive wedding flowers.