The process is much shorter than all the pictures! This is one of the 'old methods' from long ago. I've seen old antique quilts with this binding many times. When you actually see one in person, you understand how it was done. I figured it out and have been using this method for many quilts. Bias binding might be more appropriate for some quilts.
Note that the quilt used in this tutorial is my 'practice' quilt that I keep around. The backing is muslin and NEVER use muslin backing in this method! This Self Binding method is for nice backing fabric!
Step 1. When top quilting, end your quilting about 1/8 of an inch before the edge. In other words, don't go right to the edge and definetly not over the edge as you won't be able to bring the backing to back for pinning.
Step 2. Pin backing edges to the back of the quilt as close to the middle as possible. You don't want floppy backing edges, so make sure it's all pinned on the back.
end top quilting 1/8" from edge
pin backing edges to the back