UUID's

Hello. So I recently got my hackintosh to work. I think I left out an important step though, testing to see if the UUID was taken. I generated all of that stuff like the serial etc. with genSMBIOS but forgot to check it. - Is there a way of changing it after the fact? How big of a deal is this? It seems like the odds are in my favor of being fine with my current UUID and serial, but I am just being thorough.

Thanks!