[量力而行, liàng lì ér xíngㄌㄧㄤˋ ㄌㄧˋ ㄦˊ ㄒㄧㄥˊ] to assess one's capabilities and act accordingly (成语 saw); to act within one's competence; One does what one can.#28464
[量才录用 / 量才錄用, liàng cái lù yòngㄌㄧㄤˋ ㄘㄞˊ ㄌㄨˋ ㄩㄥˋ] to assess sb's capabilities and employ him accordingly (成语 saw); to employ sb competent for the task#160796