What is the origin of the idiom "on pins and needles" and when to use it?

The origin of the idiom "on pins and needles" can be traced back to the 18th century, specifically to the practice of cushioning furniture with pins and needles. During that time, upholsterers would use pins and needles to secure padding or stuffing in furniture, such as chairs and cushions. This phrase is commonly employed when waiting for important news, results, or outcomes, such as waiting for the results of a job interview, a medical diagnosis, or the announcement of a competition winner.