Like woodchuck said it will come with new studs.
Complete hub unit, it will have new studs, abs sensor and harness already installed so just unplug and plug in there.
No pressing required but the old unit might be a little stubborn to get off, a little muscle/persuasion might be needed
Hub to knuckle bolts 133ftlbs
Axle nut 177ftlbs
Caliper pin bolts 80ftlbs.
Defiantly buy a good unit, GM, or the Moog ones are pretty good.
I have not seen any of the good quality ones with a lifetime warranty like jackelope mentioned but he may know something i don't (usually the cheapy ones boost the lifetime warranty).
Not super hard job to do at home