With new irons, you might want to do what I call an eye check.
Go to a room in your house where the floor has square tiles. Take a stance as if you're addressing the ball, and line up the clubface square to the back line of a tile. See what that position looks like to you. You may find it looks a little closed or open. This is because your eye is trained to see square as it looked for your old irons.
When I first got my X20 irons, I often faded or pushed the ball. This was because my old irons had more offset than the X20s, and when I matched the old look at set-up, I was leaving the club a couple of degrees open. Once my eye got used to the new square (see blue clubface line in lower right box), I hit the ball fine (as long as I kept my head still).