I've been able to get help with a plumbing repair on more than one occasion. The key to me finding who can do a particular job is to just research them before I hire anyone. The problem a lot of people have is that they like to speak a big game about what they can do, and then when they come out to help you they don't do that well.
That's why I turn to reviews and make sure I never hire anyone that has a poor reputation. That way, I don't get ripped off or have to get the problem taken care of multiple times.