Yes you can, but check before you buy to make sure that this is possible. When you first use your new irons your loft and lie will be adapted to your current game. As you progress and improve, your swing will alter and your loft and lie will change, so it’s important to get irons which can be adjusted. Cast irons are harder to adjust than forged irons. They can usually only be altered by a couple of degrees or there is a risk of them breaking. Forged irons can be bent a little further and some irons have a hosel which is designed to help you adjust this.