thanks again for this usefull info.
I'll certainly will take into consideration to work with a local later on when I this Opaka-piste seems a good one.

I've used the ITS link and filled in the form to find out more details on my direct relatives.
My grandma Sawulak Maria (born in Polish Zywaczow on 6/6/1925 now oekrains zyvaciv in Oblast Ivano-Frnkivis'ka), her father was Jozef Sawulak and mother was Telka Mielnieck.
she was deported as young girl to work for the Germans.

this village is much further than Opaka so a complete different research. I'll see what the official papers can tell me and meanwhile will use all other tips as well.