When you have a leaky pipe, the first thing to do is turn off the water source for that pipe. If the plumbing is under the kitchen or bathroom sink or leading to the toilet, then the water valve should be right at the source.
First, if the leak is behind the wall, which it does sometimes, you need to determine if you have a wall access panel to see the damage. The truth is that some homes have them and others don't.
This is where many people decide to leave the repair of the leaking pipe to the professionals. Fixing a damaged wall, especially drywall, can be a difficult task, that is why you should always rely on professionals for repair of leaking pipes.
A plumber can easily repair a hole in any leak. Experts use tools like epoxy, plumber's tape, and rubber tubing to repair holes or even small cracks in the pipe. If the pipe has broken and has occurred between the joints, they can even replace the entire pipe and properly seal the joints when they’re done.
An on-site assessment will definitely need the assistance of someone who’s experienced and trained. And no one is better equipped to repair leaks than a professional plumber.
You need to make sure you know what projects you can handle yourself and which projects are best left to the professionals. Plumbers get paid well for a reason, which is because there are so many jobs that just aren't easy for the average person.