There are a lot of things you can be doing to prepare yourself to learn UX Design with DevMountain. They include, but are not limited to, the following:
Get a taste for the design technologies you'll be using like Sketch, and practice! There are a lot of different resources students have used in the past to start learning: www.lynda.com, http://blog.usabilla.com/12-of-the-best-online-ux-resources/, https://www.youtube.com/playlist?list=PLLnpHn493BHE6UIsdKYlS5zu-ZYvx22CS You may even start reading "The Design of Everyday Things" by Don Norman
More important than understanding how everything works, is knowing that you can be passionate about it. A passion for the work makes all the difference in being able to focus and commit to what it takes to be a successful designer.
Make arrangements to dedicate the necessary time for the course. Full-time Immersive courses are made up of 40 to 60 hours of required pre-course work (readings and exercises that need to be completed before class starts) 40 class hours/week, and 10 to 20 hours outside of class on project work and practice. After hours courses are made up of 30 to 40 hours of required pre-course work, 11 class hours/week, and between 10 and 20 hours outside of class for project work and practice.