驾轻就熟 easily and skillfully
Explanation
驾轻就熟，意思是驾着轻便的马车，走着熟悉的道路。比喻对某事有经验，很熟悉，做起来容易。
Jià qīng jiù shú means driving a light carriage on a familiar road. It is a metaphor to describe someone who is experienced in something, familiar with something and can easily do something.
Origin Story
老张是一位经验丰富的木匠，他制作家具已经有三十多年了。从选材到雕刻，再到最后的打磨，每一个步骤他都烂熟于心。最近，他接了一个制作一套古典红木家具的订单。这套家具设计精巧，工艺复杂，对木匠的技术要求极高。但是老张并没有感到丝毫的压力，因为他对红木家具的制作工艺了如指掌。他轻车熟路地完成了每一个步骤，整个过程行云流水，一气呵成。最终，他制作的家具完美地展现了古典红木家具的精湛工艺和艺术价值，客户对他的作品赞不绝口。老张的成功，正是因为他多年的经验积累，让他在面对挑战时能够驾轻就熟。
Old Zhang is an experienced carpenter who has been making furniture for more than 30 years. From material selection to carving, to the final polishing, every step he is familiar with. Recently, he received an order to make a set of classical rosewood furniture. This set of furniture has exquisite design and complex craftsmanship, which requires high technical skills of carpenters. However, Old Zhang did not feel any pressure, because he is very familiar with the production process of rosewood furniture. He completed every step smoothly, the whole process is smooth and efficient. Finally, the furniture he made perfectly demonstrated the exquisite craftsmanship and artistic value of classical rosewood furniture, and the customer praised his work.
Usage
形容对某事非常熟悉，做起来轻而易举。常用于描述技能、经验和熟练程度。
Describes someone who is very familiar with something and can do it easily. Often used to describe skills, experience, and proficiency.
Examples
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他做起这活来真是驾轻就熟。
tā zuò qǐ zhè huó lái zhēnshi jià qīng jiù shú
He is very familiar with this kind of work.
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对于这些问题，他已经是驾轻就熟了。
duìyú zhèxiē wèntí, tā yǐjīng shì jià qīng jiù shú le
He is already very familiar with these problems.
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他处理这类事情驾轻就熟。
tā chǔlǐ zhè lèi shìqíng jià qīng jiù shú
He handles such things with ease and familiarity.