Well, you can either hang it to dry and then trim it, or trim it wet. From years of experience, I can tell you that dry trimming is a lot easier and does not gum up the scissors as much as trimming the plant wet. Some people will argue that the plant will dry faster with its head leaves and stalks removed, which is true. But if you are not in a rush, then drying the plant first will make for easier trimming. It all comes down to the quantity you have to dry, the space you have for drying and the quality of the finished product.