One rule is to not use complicated techniques unless they are necessary to achieve your goal. First, use simple movements, and if they don't work, then introduce the more complex ones.
Bruce LeeA good teacher can never be fixed in a routine... each moment requires a sensitive mind that is constantly changing and constantly adapting. A teacher must never impose this student to fit his favourite pattern; a good teacher functions as a pointer, exposing his student's vulnerability and causing him to explore both internally and finally integrating himself with his being. Martial art should not be passed out indiscriminately.
Bruce LeeWhen we suddenly awake to the realization that there is no barrier, and never has been, one realizes that one is all things mountains, rivers, grasses, trees, sun, moon, stars, universe are all oneself. There is no longer a division or barrier between myself and others, no longer any feeling of alienation or fear there is nothing apart from oneself and therefore nothing to fear. Realizing this results in true compassion. Other people and things are not seen as apart from oneself but, on the contrary, as one's own body.
Bruce Lee