Good luck finding 10mm thats hub-centric you can get 8 or 15 20 25 30 .... if you cant find any just get hub-centric rings to put in afterward, but maybe thats just my part of the world,
unless you get a spacer like this you will need longer studs.
http://www.drivenperformance.co.nz/scripts/prodView.asp?idproduct=1446
Studs are easy to change, just remove the caliper and disk, then put a wheel nut (one you dont want to keep), onto the stud and smash it with a hammer, it will just fall out the back, remember when putting in new studs that you will have to tighten them with a torque wrench to about 120nm then do it again after a few hours driving then again after another few hours driving as you need to wedge the head back in tight as, you dont want to try to pull them into there seat by tightening them with something like a large extension bar on a ratchet, as you will just weaken the stud by stretching it, after a short while they bed in nice and tight.
With a wheel nut you want to have at least 7 rotations on it.
Also with the studs out this a really good time to clean the mating surfaces of the hub, the inside of the hat on the disk and the outside, if you wheels have a build up on the inside of them where they touch the disk clean them up also, simple job to do with a wire bristle disk that goes into a drill or something like that, this will remove alot of wheel (steering) vibration as the wheels will spin more true.