Once the wheel is off, tapping it with a mallet is all you have to do. The wheel holds the drum on the car.

As for the stud for the lug nut, you could try checking the on-line manuals. http://2gnt.technologic.org/

Unfortunately, I do not remember how to change them, but I think it isn't supposed to be too diffucult.

What happened, did you break a wheel stud?