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A dictionary will teach you how to correctly pronounce the word and break it down for you. Go through a page of the dictionary each day. Pronounce each words slowly and carefully. Look at the breakdown of the word if you're having trouble pronouncing the word. It's also an option to go to Dictionary.com or whatever the equivalent is for the accent you're working towards. An online dictionary gives you the option to hear the word pronounced out loud for you. It's also free as long as you have access to the internet. It's even better to use a print and online dictionary simultaneously. You can keep the print dictionary with you and listen to the word spoken aloud online. Books and audiobooks can get expensive, and that's why using your local library is great. If you don't already have a library card, get one. Then, use that card to check out books on language, books in the language you're working on, and audiobooks and/or movies. This will save you money and allow you to check out new content as often as you'd like.
Buy a pronunciation dictionary. Use an online dictionary. Check out books and audiobooks from your local library.