From Vertical Hostel in Nikiforovo the trail through the forest is easy to follow. Once you get out of the forest the markation disappeared. Follow the road that bends to the left and enter another forest. Here the road stops, but you'll have a path if you stay on the right side of the little stream. Follow this path until it opens up and make your way to the sheepfold. From there you basically go up up up to the top of Sandaktash.
Arrival by train, car, foot or bike
Author’s map recommendations
In the NP officice in Mavrovi Anovi you can get the map of Mavrovo National Park.