Jaro, your English is fully understandable, don't worry! I'd also like to welcome you officially on Mobile Read, we're happy you're here!
Abelturd, in my case, speaking three languages is kind of easy - I work with hispanophones and anglophones almost daily, so I have no real trick. Although, when I was learning German, what helped me with the accent was talking aloud to myself (looks more than dumb, but hey, if it works!) and repeating sentences I heard in movies until I though I sounded allright. Otherwise, it's as you feel it!