Try calling Meylach Shechet, he is an important Jewish figure in Ukraine, he lives in Lviv and protects many Jewish sites. He may have a guide for you.
Meylakh fenced in the massive Pidhaitsi Jewish cemetery about 10 years ago.
I sent Meylakh a skype message with your email address.
I used Lviv-based Alex Dunai in 2000 as a guide. He drove me out to Pidhaitsi and interviewed people and translated for me, so I understood what everyone in the town was saying (they were nice people in town and local efforts were recently made to clean up and secure the synagogue).
I met Alex 16 years ago so it is possible he does not do tours anymore.
In Lviv tel:
Or read this Yahoo blog regarding tour guides for the Pidhaitsi area:
Hello, my great grandfather was born in podhajce (now in Ukraine) and emigrated to the US at the end of the 19th century. I happen to be in Ukraine now and plan to visit the town where he came from. Does anyone have any contacts in the area who I might reach out to for information or assistance?