Water trickling in copper pipe can make soldering a joint almost impossible because you can't get the fitting hot enough. Stuffing a wad of bread into the pipe will absorb the water and you can get done before it dissolves. But use white bread; whole grains can get caught in valves. Before turning water back on, temporarily remove faucet aerator.
Before putting your house on the market, attend a few open houses at similar properties in your area. That will give you a firsthand basis for comparing your home with competing properties. It’s also a good way to take the pulse of the local market and to spot some of the selling brokers who are active in it.