It is a simple replacement, but not without some need for caution. Buy a new Price Pfister faucet that has the looks you want. Remove all the parts from the old faucet including the internal seats, (that is important). Then install the new stems and trim from the new faucet, (remember you do not need the seats and if you do not remove the old ones or if you install new ones you will damage then stems). If you did not leave the old black plastic seal rings on the body when you removed the old stems, you have a new lifetime guarantee faucet, assuming the old one is not a Crown Jewel pattern. A picture would help us tell which model you have, in case the above directions have to be modified.