If you are not a native Spanish speaker, you first have to start by learning Spanish and becoming fluent in it. Give this skill 2 to 3 years and get certification for your knowledge through training or test. Then, you must spend 1 to 2 years working on applying your skills in the practical world and building an English to Spanish translation portfolio. Finally, depending on your pace and dedication, you can master the art in 2 to 4 years.