Going from English to French or from French to English is notoriously tricky accent-wise–while English is an accented language with more nasal and guttural timbres, while French is 'flatter' and tends to be spoken ('intoned') closer to the mouth: When going from English to French, a lot of the work has to do with 'ironing out' the intonations of English, whereas French speakers must conversely pick up set of sounds they aren't used to pronuncing–or even hearing. The most useful organ when it comes to building pronunciation is actuallynthe ear: listening to the TV, the radio, or French people in conversation, try and pin down how they sound attempting to replicate it. It pays off to repeat a complicated word over and over, slowly (even closing your eyes to put maximum focus on your auditory sense). But it also helps to visualise the word as you enunciate it, thereby linking its graphy and its sound. Little by little, you can then practise reading French texts out loud, slowly and as confidently as you can, as if you were saying it to a conversation partner. All this will gradually build and develop your ability to have entire conversations in a commendable French accent!