I have a general question and a specific question. Do iron sets come from the manufacturer in the standard settings, and then adjusted for stronger or weaker lofts and upright or flatter lies later in the process?

Also, if I want to adjust an existing set of clubs with a stronger or weaker loft. Is this something a local golf shop can handle? Finally, if I acquired a used set of clubs that were say 2* upright and I wanted them adjusted back to a standard lie would this be a simple process as well?

Curious as to how all this adjustment occurs and it’s affect on the clubs. Thanks.