Some kids just push their hands across their body before anything else is done to get the barrel to the ball. Those kids need to be able to develop a feel for working the barrel around their hands/forearms in addition to the direction "feel" which is often implicit/intuitive in developing hitters swings. Swing should appear to be taking place on the catcher's side of the body and not vice versa (stolen from FP26 who stole from Tewks.. ) An absolute is HL hitters getting the barrel behind the ball (as Mudder's stated) as early as possible. Cannot do that with a swing which is initially all translation of the hands.
Just providing some visuals for "catcher's side of the body". Pattar explained it well...