I would also say that if you have sitbone pain you're headed in the right direction. It means that you are actually sitting on them. It is largely a matter of toughening them up. I don't know how much you had been riding previously, though. If you had been going for hours without sitbone pain on your previous bike/saddle, it's a different story. But it's normal to feel some discomfort at first if you are not accustomed to cycling long-distance...

Even my office chair gets uncomfortable after a few hours!