- 胸有成竹 [xiōng yǒu chéng zhú]
- have a well-thought-out plan, stratagem, etc.; a well-regulated mind; get it all together; have [keep] a card up one's sleeve; have a preconceived idea at heart; have a well-thought-out plan beforehand; 奾ave got it all worked out; have had ready plans [designs] in one's mind; have ready plans to meet a situation; have sth. up [in] one's sleeve; have things as a whole well thought out beforehand; know what to do in one's mind; stratagem up one's sleeve; with complete confidence
Young as I am, I already know what career I want to follow.