If it's like other FWD cars with rear drums, the hub bolts on to the beam axle or knuckle and you MAY be able to get to the mounting face with the drum off.
Remove the drum and take a look. You will see if you can get to the hub where the studs are pressed in.
There is a tool to press out a broken stud. If you can work in there, then it's not too bad.
If it's anything like wifey's Camry, the hub assembly can be removed by removing the 4 bolts that hold it in place and you can work on it off the car.
However, I suspect you can get the special tool in there while it's still on the car, and installing the new one is as simple as feeding it through the back and using a lug nut with the flat face of that nut facing towards the hub to draw the stud through that hub face.http://autorepair.about.com/od/fixityourself/ss/wheel_stud_repl.htm
That shows them driving out the old stud by using a lug nut on the stud to hammer it out. I suppose that would work as well, just buy a lug nut AND a stud in case you booger up the nut.