If you have to shut off your plumbing system for maintenance, fill up a few buckets of water so you can still flush your toilet. Fill the bowl with a full bucket to flush it. This will prevent your toilet from clogging if you need to maintain your plumbing system.
Before you start a plumbing project you should tighten all of the pipes that are easily accessible. Especially if your pipes are making a range of loud banging sounds, as this is a clear sign that there are loose pipes along the line. It is also a good idea in case there is a clog so the excess pressure released does not break a loose pipe.
Solder with safety in mind. When you solder a copper pipe you want to direct the flame on the copper pipe. The flame of the torch has to be four inches away from the piping. The flame should be targeted directly at the point where the copper piping needs to be disconnected.
Make sure to never leave any flammable liquids near your water heater. Certain liquids like gasoline, solvents, or adhesives are flammable, and if left too close to the water heater, can ignite. If you have to have these liquids in your basement, place it far away from your water heater.