It depends on what you mean by "West Coast accent". Generally, the stereotypical Surfer Dude/Valley Girl accent is looked down upon in professional circles unle

It depends on what you mean by "West Coast accent". Generally, the stereotypical Surfer Dude/Valley Girl accent is looked down upon in professional circles unless you live in Los Angeles or you're a Kardashian. If by "West Coast", you mean the relatively neutral accents of, say, Silicon Valley employees and CEOs, then you should look for American movies and shows featuring Brits imitating modern-day Americans (Christian Bale, Hugh Laurie, etc.) and compare those performances to the actors' original voices in order to get an idea of how they "translate" their accents. Cartoons are also helpful[1]. A British voice actress by the name of Theresa Gallagher does a nearly flawless "neutral" American accent as the mother of the titular character in The Amazing of Gumball. An accent coach is certainly a good investment, but it helps to be specific about you're goals. Doing so will save you money in the long run. "Sounding native" depends on time, location, and association as much as it does on enunciation. You may know this already, but the West Coast is a big place. Just as the accents of most Englishman aren't solely split between the * Made in Chelsea* crowd and Sir Humphrey Appleby, there is no monolithic West Coast accent. [1] Trivia: many cartoons are recorded and animated in and around Burbank