Watch Mastering The Art Of Trials for Free: How to Stream the Movie Online at 123Movies. . Mastering the Art of Trials is a compilation of 38 skills that are demonstrated and described in a clear and concise format within four phases of abilities. The purpose of this film is to help make your learning curve as efficient and complete as possible. With this film, and a bit of practice, you’ll be on your way to Mastering the Art of Trials!