Before learning how to install curved stair nosing, I messed up a lot of material for which I had to pay out of my own pocket. If you are newbie to the hardwood floor installation, do not ever do this job alone. It is best to invite an experienced hardwood floor installer who will show, explain and will teach you the art of curved stair nosing installation.
No need to be tempted by the high cost of the work for rounded stair nosing. If there is not a floor professional next to you, it is best to give up this project.