Sometimes fixing a broken or leaky pipe is a simple as screwing a few bolts, removing the pipe, putting in the new pipe, and finally tightening the bolts. In a best-case scenario you take off your old pipe, bring it to a hardware/goods store, you match the pipe, and then you replace. Only a few tools are needed for the box, like a bucket, monkey wrench, and sealant. You can do this job by yourself; however, it might not be in you and your homes best interest.
A best-case scenario means that your pipe comes right off and the new one goes in smooth, but that is usually not the case. You change pipes for a reason, and those reasons usually are related to rust, deterioration, or some other problem. A lot of the time it isn't so easy to get the pipe off. There are specialized tool to help in situations where bolts are rusted in place, and any good professional plumber will have them.
Another reason to think about professional plumbing is the fact that some piping is hard to get too and work with. It would be really simple if the U-pipe under one of your sinks needed to be fixed, because there is easy access to it. You also don't have to worry about turning off the water main when doing a fix like that. Pipes can sometimes be hard to get too, and in some case pipes need to be cut out with a hacksaw. Don't put yourself in a situation where you are destined for failure, and especially when it comes to your homes plumbing.
Lastly, a plumber is important to pipe repair, because if your repair isn't done properly then can we even call it a repair? Getting the correct/perfect fit for pipes, whether it be new instillations or gluing back old pieces, can greatly effect the over all plumbing in your home, from leaks, to pressure, and draining issues.
When your plumbing starts to fail call the best plumber in Manhattan, New York has, so that you know your plumbing job is done right.