Jack,

Yes, stretching is essential to a good and safe shave. Since faces are different, and different skins, too, there is no specific pattern for stretching. Each shaver will have to create his own pattern.

I have viewed many shaving videos and found most to be worthless, and some improper for newbies. Lynn has several excellent shaving videos. So does Geo Fatboy. Shaving the chin is included in these videos, but I have never seen a video dedicated to shaving the chin.