Design and dev work is no longer a bottleneck to start testing. Simply open up the Optimizely dashboard and use their WYSIWYG editor (What you see is what you get) to start changing content. If you are lucky enough to have design and dev resources, then you can simply create a redirect test that points to your new design.
Optimizely is used to A/B test our entire website and marketing landing pages. By creating different types of content around different products and features, across different sources of traffic, we are able to test various messaging to find the 'optimal' one that works for a specific segment.
Ensure that your Optimizely JS script is loaded in the header of the page. The reason for this is that the DOM loads the page, and if you are changing elements on the page in your variation, Optimizely needs to know this before the page loads so that it can make those changes for your variation.
Though you don't need to be technically savvy to use Optimizely, it can help. Understanding what a DOM (Document Object Model) is and how the web basically works will help you to create variations and goals much more easily.