I think that there is a confusion between surface thoughts and instructional thoughts that inhibit people from learning this core skill. Surface thoughts are random instant messages that you suddenly think up out of nowhere. Whereas the instructional chain of thought is also thinking, it is focused in getting the random thoughts to quiet down so you can concentrate on one problem/thing at a time, bringing more of your attention and energies on to thinking/focusing towards fixing that problem.
Later
-FT
Later
-FT