The degree of difficulty varies from case to case and should be evaluated by the lawyer who processed the H-1.
In my view, getting a visa stamping is no more difficult than it was a year ago. The big difference is the consulate may insist on a letter from the end client, the job site where your son works. Other than that, his stamping should be no more difficult than when he got it the first time. As to the procedure, I suggest you check the consulate's web site. They tend to be fairly comprehensive.