I like to trim the back of the large circle and can reuse the discarded fabric. So very carefully separate the back of the circle for the newly sewn unit and cut a small slit. Then you can very slowly trim the excess circle close to the seam line.
Set the excess part aside.
Now take the 5-1/2" cut circle and sew it on top of the first unit.
Now one more circle goes on the top. This is the small 3-1/2" circle. Now is a great way to reuse the first cut out from the back.
Now your homework is to get all your blocks sewn in this fashion. Make as many blocks as you think you'll need for the size quilt you want.
I'll post the next step in two weeks on Feb 9!