Hi, that cut shouldn't be a problem as the long layers are cut evenly all through the back and the sides. But remember, cutting long layers into your locks does not mean it will sit as pictured. That particular hairstyle requires styling time and products to look the way it does. In regards to your other question, hair should always be cut wet when using scissors. Only clipper cuts can be cut on dry hair. I hope I've helped! Kind regards, Serah Schuster - THS Hair Consultant.