So you haven't even taken your wheels off before?
well get a jack & maybe a friend to help you, use your owners manual and jack up the acr from where they say. If you don't have aftermarket rims pop off the center cap and use a lug wrench while the car is still on the ground to losen the nuts then jack it up & take them the rest of the way off. If the rim doesn't come right off give it a little love tap on the tire
intalation is the reverse- use about 90ftlbs of torque on a torque wrench(or just use a breaker bar & give 'em good ol' german torque-goodntight) Some will say you have to use a torque wrench but if you've been doing this long enough to know- you don't
have fun remember to scuff the surface of the drums before painting with a scotchbright pad & some paint thinner to remove any dirt or anything & let the paint dry otherwise your rim will be stuck the next time.