How to shorten the sleeves of a dress shirt

How to shorten the sleeves of a dress shirt.
There is no way one shirt can fit everybody. We are all so different. Even if our bodies were very similar, there are so many details we'd have to consider to meet the needs/ preferences of every person. Can you imagine the cost and the waste to put all that into production, just to make a shirt to meet the specific fit and preferences of every detail, fabric, print, and color for every person? It just can't be done. That's where I come in. I will share my knowledge, experience, and my instincts with you, so you can get that great fit in your garment.