I just purchased from Joanne's my first pair of Gingher Scissors. I've never owned an expensive pair of scissors and was so tired of my Fiskars not cutting well. I bought the Knife-Edge 7" Dressmaker Shears and yes, they cut so smoothly. But, they are so stiff that they are uncomfortable to cut with. Do I need to "oil" them or just continue to use them until they loosen up??