hi,
i am just a student
i would highly recommend you NOT to try to improve pronunciation by using the traditional phonetic spelling of the dictionaries
why? pronunciation in english is really full of subtlenesses and you should avoid learning to pronounce a word incorrectly
any tiny imperfection when pronouncing a word may lead the hearer not to understand what you say or, worse, understand something you don’t want to say
i would recommend you to use one of those many dictionaries with sound files. you can actually find some of them on the web. try
www.allwords, for example.
regards