The USPTO is geared to serve laypersons and even has Ombudsman Services to help US citizens write and file their own patent applications, as well as helping applicants through the examination process that may lead to being awarded a patent. No one knows the details of a invention better than the inventor so they are likely to write excellent specifications. But, there is an art to writing high quality patent claims and it is highly recommended to have a tried-and-true patent practitioner accomplish this task. The claims are the most important part of the patent application. They define the breadth of the invention, which leads to maximizing the protection of your Intellectual Property.