Make sure that you make a good assessment of the work that you require to be done before you make your final decision. You may not have all of the time to hire a qualified professional. Make sure that you take the time to do the work yourself to ensure that it is done correctly.
If you want to be sure that the pipes are the right ones for the job, it is best that you ask for references from other people that have the same problem. If you are satisfied with the work of a company, you will be more likely to want to work with them again in the future.
Find out the history and reputation of the company before you choose to have your work done by them. Make sure that you are able to get a quote that is within your budget. Make sure that you get quotes from more than one company so that you are sure that you are getting the best deal.