You can google "_____ pronuniciation" for whichever word you cannot pronounce. You should get several dictionaries that have audio pronunciations of the word. You can listen to the pronunciation and learn the proper way to say it.
For example, here is the pronunciation of Louvre
http://dictionary.reference.com/browse/Louvre (notice there are several, some are more english sounding, some are more french)
I googled "Louvre pronunciation" and got a list. Then I just chose the dictionary site that I wanted to go to.