This type of site is one that can be done different ways, either you can edit the articles or have the designer do it for you at a cost.

Doing some of the editing can save you money providing the designer allows you to do it.

Myself I think that owners should be given restricted privileges so they can edit their site.

Doing CMS like I do, I use WordPress or Joomla and make the template a responsive template so the site can be viewed with mobile browsers.