Pop into White Magic (opposite the Samokov) and ask Christo if he can help you out. He represented Bulgaria in the 1984 Lake Placid Olympics and is a great instructor
There are loads of locals willing to give excellent tution and I have paid about £15 for 3 hours before. Absolute bargain compared with the £80 I paid at snow dome for 2 hours.
We had a fantastic Guy called Jordan for some private tuition, he was very good, I'll See If I can find his business card and get his number, I think we paid 50 LEV for an hour, but with one to one tuition you learn much more than in a group, (where you will spend 90% of the time standing waiting for the others)