Interior design is a highly competitive field that requires more than just an eye for aesthetics. To be successful in this profession, one must have the right skills, credentials and tools to stand out from the competition. In addition to these essential skills, there are also certain tools that how to be an interior designer should have in their toolkit. Firstly, a good quality sketchbook is a must for any designer ? it?s the perfect place to brainstorm ideas and start working on sketches. Additionally, having access to software.