I've been working with Tealium products extensively and am the creator of the UDO Debugger extension for Chrome. Recently, I completely refactored the tool with a lot of cool features that I hope will help other analysts and developers who work with Tealium products.
Implementing the Tealium Universal Tag (utag.js) on your website isn't rocket science, but it does require a fair amount of pre-planning and requirements gathering. We have a whole team of implementation specialists dedicated to guiding customers through this initial process. It's a non-trivial amount of work to get a robust implementation deployed to your production site. Which is why it's worth thinking about your long-term strategy for maintaining that implementation.