Iron lie is critical

One of the key factors to buying new irons that will work for you is to make sure they have the proper lie angle.
If this is out, your entire game could suffer.
To check, have a friend or shop assistant make sure that the entire sole of the club is lying flat on the ground when you set yourself up to play a shot.
If either the heel or the toe is in the air, the clubs don’t fit you and can only cause you grief.