Still can't manage the back

So I went for my professional re-tightening today.  The front of my hair which I had done myself looked great, and was done well.  However, the back was another story.  I only did a few rows, but they were not well done.  I apparently messed up my lock pattern on some of these locks.  My loctician encouraged me once again to take a retightening class so that I can be taught properly.  I am seriously thinking about it.

By the way, my retightening session lasted one hour!! Yes, one hour!!  This was because I had done the front myself, and therefore cut the loctician's time in half. This really encouraged me to continue to try to help myself.