without a hitch

(of a process or event) without encountering any problems, difficulties, or obstacles

The origin of the idiom derives from the meaning of the word "hitch". The word "hitch" has been used in English since the 13th century, and it originally meant to fasten or attach something. In the 16th century, it came to be used specifically to refer to the rope or chain used to attach a horse to a carriage. If the hitch was secure, the carriage would run smoothly and without problems. This is why the idiom "without a hitch" came to mean without any problems or difficulties.