Actually it is easier than you think. The "y" is the same sound that Kiwis make for "i" when pronouncing "fish" or "milk".
Does not compare to the Aussie pronounciation of fish or milk (where the "i" sound is like last vowel in "Kopczyński")
What tends to be less obvious for English speakers is the "ń" which indicates a soft sound, identical to Spanish ñ in "mañana" ("tomorrow") or to the sound nh in Portuguese as in "manha" ("morning").