How to pronounce Polish name "Niedzolkowski"?

"Niedzolkowski" is the surname of my great grandparents on my mother's side, who were immigrants from Poland. How exactly do you pronounce it in its authentic Polish pronunciation and dialect?

Nyeh-jih-OL-kov-skee!

The "dz" is a complex sound and its very hard to think of a "word" that depicts it correctly without actually saying it. Put your mouth in a square, teeth shown clamped together, and make the sound a plane makes! That is the best way I describe "dz"

You should also know that in Polish the correct spelling of your surname is rather: Niedziołkowski than Niedźiołkowski.