If you have to jiggle the hose as you pull out your kitchen sink sprayer, chances are the hose is catching on the shutoff valves. For smooth operation, slip 1/2-in. foam pipe insulation over the pipes and shutoff handles. Tape it if it won't stay put. Get the insulation at home centers for about $3.
Fill the space between two stainless steel sink basins with expanding foam. The foam deadens vibrations and lessens the gong effect. It's possible to do this with the sink in place but much neater and easier before installation. Either way, let the foam harden and then trim away the excess with a knife.
You don't have to run to the neighbor's bathroom during a plumbing project. Before you turn off the water supply, fill 2- gallon buckets with water. Flush the toilet by dumping the water in the bowl. You'll get one flush per bucket. Works just as well as the usual method, although it won't refill the bowl.
Before you remove a sink trap, give the drain a few plunges with a toilet plunger. This will push most of the water out of the trap, lessening the mess when you pull the trap. If you have a double sink, be sure to plug the other drain to contain the air pressure. If the strainer isn't a screw-down style, you'll have to hold it down while you plunge the drain.