Content management systems greatly simplify the setup and operation of websites. And, it's easy to be wooed by the sexy look of pre-built themes and templates, but tweaking pre-built sites can be tough.
When used in combination with one of their custom themes, Themeify.me greatly simplifies the task of customizing the look of pages on WordPress websites. Still, unless you want to use the exact look they provide with their themes, you'll have some work to do.
If you have an existing WordPress website, you'll want to read this overview of theme-related actions, thoughts, and considerations when working with a pre-built custom theme on your WordPress website.