why go for teachers? those folks don't need no internal stuffs other than a good dimsum buffet? besides, they have been trained with lots of bad habits, and would take too long to de-program, if even at all possible.
now us beginners on the hand, whichever other hand, have not accumulated bad habits so it would be easier for us. so for us nobs we can stuff internal stuffs in, whereas, teachers have to stuff the internal stuffs out. i think i just confused meself.