揣时度力

Explanation: Appraise the situation and assess their ability 　　Usage: Joint type; as predicate, object; with compliment 　　Source: Ming Jang, "A phase XU Cun Zhai Master Book": "unworthy surmise when the degree of force, and fail to want to go begging." Thesaurus:  to act with due consideration of one's own abilities Antonym Group:  stand by a stump waiting for more hares to come and clash themselves against it— trust to chance and windfalls, Jiaozhutiaose, Jiaozhuguse