Wheel nut studs

Recently I had a Wheel nut stud break on me when I over-torqued the lugnut. I had enough to put a lugnut back on securely, or so I thought. I got about 40 miles on it, when I noticed that my car was shaking like a nut was loose. So I get home and check it out and find out that 2 wheel nuts are completely broken off. I bought a chiltons manual to get info on how to replace them and it is extremely confusing on whether on how to take off the caliper and if what I should do after I get the caliper off. So how do I go about replacing these studs?