I only have one question. Why waste the time? You may find the its easier in the long run, and more cost effective to replace the faucet. The cost of a new Delta or Moen is not that much. The installtion time is a little over an hour. With the right tools, the faucet will come out quickly (basin wrench and cressent wrenches). In addition, a faucet is not a permanent part of the house. You can make the bathroom look fresh with the addition of a simple faucet. In addition to that, the repair on an old faucet has a limited life span. If its been leaking for a long time, the seats may need to be replaced and the calcium, which has caused the handles to be difficult to remove, is probably on the finish to the faucet as well. Any faucet over 20 years old should be replaced, unless the faucet is a very special brand with fancy handles and a special look to it. Most faucets installed in bathrooms over 30 years ago were under the same constraints as today, budget.