nǐ / méi / yǒu / zuò / hǎo / zhǔn / bèi / jiù / tiǎo / zhàn / zhuān / yè / xuǎn / shǒu / wèi / miǎn / yǒu / xiē / bù / zì / liàng / lì

你没有做好准备就挑战专业选手，未免有些不自量力。

Challenging professional players without preparing properly is rather overestimating your abilities.