Customizing themes

I want to work with WPMU themes to help avert plugin compatibility issues. However I will of course need to customize colors, fonts and upload logos etc. I got hooked on Genesis themes because of documentation that makes this sort of stuff pretty easy for non-coders like me. For instance, I want to try Scholar but I need to change theme colors and upload logos. Is there support here for such stuff or am I better off staying with what I know? thanks!