Broken wheel stud

Not good! The axel must be removed from the upright to gain access to the stud. Usually the upright must be removed from the car, the axel nut removed (should have been torqued to 300ft lbs), yoke removed and the axel pressed out with a hydraulic press. The brake rotor must be carefully supported a full 360 degrees to prevent it from breaking during the axel pressing. Broken studs are one of the reasons I never let anyone mess with the wheel studs, epically tire stores. This page might be helpful http://www.panteraplace.com/page87.htm

I agree with Mike, the hardest part of the job may be finding a machine shop/ mechanic with a torque wrench that can handle 300 + foot lbs. Where are you located? The removal of upright is not that big of a job, provided the lower pivot has had some lubrication. It will probably take a couple hours each removal & replacement and the nut that holds the axle in place is designed for a one time only use. They are different right from left and are available from the vendors about $15.00, I believe