You don't need to be programmer to be able to install and use our themes.
I'm not sure which theme you're referring to specifically, but I'll use ClassiPress as an example.. You can see the initial steps of the installation process
here for an idea of what is involved. If anything, installing the theme is pretty straightforward, it's more the WordPress installation that you may wish to look into, although, depending on your
hosting provider, some such as Bluehost have a simplescripts installation which will make that part even easier.