I've made them a couple of times. The last time was about 3 years ago. I got my directions on line (free). I had made a quilt top for the window and then double backed it so the roman shade sewing lines did not go through the quilt. Soon I will be taking apart the roman shade and enlarging for a twin bed.
I sewed the rings on with the machine. Just be careful to measure accurately :!:
Plan the distance between folds, it let's you balance the appearance when pulled open.
I used hook and loop to attach the shade to a piece of wood attached to the wall which I also covered with fabric.
I used a thin nylon cord which was designed for roman shades. It is much better than fishing line like I used the first time around.