>>864
Pronunciation is pretty simple. Apart from らりるれろんふ, the consonants are pretty much identical. Do a bit of research on the vowels (reading and videos) because although a vowel sound may be comparable in one regional version of English, it may be completely different in another. Most pronunciation errors can be fixed with careful listening and imitation over time, though.
It may be helpful to have Japanese media (news, dramas, anime) playing in the background even if you don't understand it so you can pick up the pronunciation there, too.
Oh, and of course, it never hurts to try and find a Japanese friend.
Your last resort would be to hire a Japanese speaker for an hour or so to take you through it. The vowels are very simple, and after that there's just the other 7 I mentioned that are the main culprits. Harshness and tones are also important, but you can pick that up by imitating various forms of media.