Ford - Focus :: 2006 - Procedure For Taking Off Broken, Rusted Hub Stud

I broke one of the wheel/hub studs on my 2006 Ford Focus, when I tried to take the wheel off. So, this car lived through 7 winters in Boston metropolitan area, and it has about 90,000 miles on it.

I bought the car used last summer, so I don't know what the previous owner did, but I have always torqued my wheels since I bought it. But one of them broke off anyway, when I tried to take the wheel off. I took off the brake caliper and the disc to see the condition of the broken stud. The hub and the stud seemed to have rusted together. I recently moved from California via Oregon, so I am not used to seeing a lot of rust on anything. So, I can't tell whether that is a lot of rust or just normal run-of-the-mill rust I shouldn't have to worry too much about.

I checked online and found that if a bolt/stud is rusted, and if I cannot get it loose by banging it with a hammer, I should torch it and let it cool before trying to loosen it again.

I would like to hear some anecdotes about loosening wheel studs. I went to Harbor Freight today to get a hammer. One guy told me I should get the 8 pounder with a long handle (looked to be 3 feet or longer), so it will be easier to aim and provide steady force. He said it would be like putting a golf ball. I was also looking to get a torch, and he said that I need to heat it until it glowed, so small propane bottle torch would not be enough. But he said for a relatively newer car like mine, a few taps with an 8-pound sledge hammer should be enough.

I am also concerned that I might end up breaking more stuff and have to replace the entire hub, which would be a costly proposition. How much would it cost if I took it to a mechanic?

Also, seeing that some of the other nuts didn't go in smoothly, would it do any good to replace all the lug nuts?