UX design is a process - understand the users of a product, test that product with them and then design solutions to make the product easier to use. Then you test the solutions to make sure they work.

Then repeat. 

This marriage of research and creativity takes patience, interpersonal skills, design experience, plus a healthy dose of open-mindedness and analytical thought.

The amazing thing about UX design is that it is all based on proof - the answers are in the research, and if you can't find the answers, you do more research to find the solution. 

Research

Analysis

Prototyping

Visual Design

Creativity

Presentation

Facilitation

Communication