When dealing with companies that offer wordpress services, you will have to ask them for a portfolio to take a closer look at the kind of work they have done on their previous projects. Seek the actual urls of the websites that they installed and customized wordpress on so that you can get an idea on the kind of service that you could expect from them.
WordPress is a popular platform used by many different websites all over the internet because of the simplicity of its use as well as the ease of customizing it with themes and plugins. You can do your website installation yourself if you are only after a basic system that you can take care of yourself.
However, if your requirement is a bit more complex falling beyond your comfort zone, you may want to seek the help of a WordPress development service provider. They would be able to research the best design for you and develop an appropriate system that you would be pleased with.
This would also provide you with an opportunity to spend your valuable time on other constructive elements because developments are better left upon the experts. When using a wordpress service, make sure you state clearly what you require to avoid disappointment.