YOU SAID:

don't put the cart before the horse lest the rider fall

INTO JAPANESE

馬がライダーを転倒させる前にカートを置かないでください

BACK INTO ENGLISH

Do not put the cart before the horse overturns the rider

INTO JAPANESE

馬がライダーをひっくり返す前にカートを置かないでください

BACK INTO ENGLISH

Do not put the cart before the horse overturns the rider