There is apparently a very big difference between a none practicing plumber and certified plumber. None practicing in a sense is referred to as, home owners or an individual who is not trained to be a plumber. They differ as well in experience and the basic and advance knowledge or a professional plumber and a none practicing one. Some usual mistake that a none practitioner of plumbing commits is connecting or joining metals if dissimilar built and make; that is why there is a need to call the Denver emergency plumber since they have been on top of this issue for quite some time.
Metals like pipes and such requires a proper connector to avoid any future issue or corrosion inside the pipe or the water system. Each metal has its own characteristic and if a non-professional is doing some installation without the proper tools and equipment, there is a very big chance that there will be corrosion inside and outside the connection thus blocking and closing the water way of the pipe. That being said, there will be a lot of fixing to do and the amount or cost of the repair will perhaps be pocket breaking. Hiring the best and experienced professional plumber would be the best way and rightful thing to do, to avoid headaches and other costly expense.