Hi i am anglo Greek  who moved here. Veliko Tarnovo before Pascha ,  I have friends who speak good english  and Greek too ,which is a   help getting things done but a difficulty in another way,  but i am learning bulgarian. I guess i am lucky because I am fluent and literate in Greek and have similar culture and am  orthodox christian  
. Although a different language , because of Religion and history many words in common and grammar forms  and of course cyrillic came from greek alphabet  in 10c.I also know some russian and could read cyrillic which bulgarian monks brought to Russians ,with Orthodox faith  in 11c,from day one . This is key .To be able to read .
So i guess i came with added bonus but to be able to read is vital as makes learning easier plus makes life easier on daily basis 
I have found speaking even baby bulgarian , and yes "Ur" sound difficult , but don't be afraid , opens doors and smiles .
Even in Post Office. !!! 
It is a lovely country and although they do not see it , but as a greek i do , quite orderly. The people , i like alot and find them mannered. And very attractive in general .
A very interesting country but if u do not learn the language even basics only , u will be locked out ,emmotionally and practically. Nikos