ok, looking at couple of the videos I remembered a few more things - the technique we used was very fine crosshatching, and achieving values by building up a lot of layers.
Although he didn't have us do a lot of CROSS hatching, as in lines at 90°, but they were somewhat close directionally. I remember the teacher said to keep directional variation no more then what you would see when tree logs would float down the river. They seldom go much more then at 45° from one another. and in most cases you would start your strokes from 'dark to light' direction.
Start with light layers and then build up. at the begining your pencil strokes would be very light, then as you go on you can get a bit more heavy handed in darker areas.
Actually I've looked probably through 20-30 videos since starting this post, and most seem to cover the very basics, and in a somewhat crude or rough way...