To progress I have to learn then to practice. For any "applied" discipline practicing imperfectly lets me memorize bad form. Therefore a (as much as possible)

To progress I have to learn then to practice. For any "applied" discipline practicing imperfectly lets me memorize bad form. Therefore a (as much as possible) more advanced practitioner than me must periodically check my practice. He must understand that some parts of the discipline may have to be adapted to each practitioner (his 'perfect' practice may not be mine)... For anything not completely theoretical (is if even possible?) this is a can of worms.