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Take tram 5 to the last stop - the tram originates behind the court building in the center of Sofia. Walk another 5-10 minutes in the same direction of the tram until it is clear you are out of that neighborhood where all the traffic is heading out of the city. A good place to stop is at or just after the last stop light so the drivers are already stopped and have time to see you. If you are lucky a trucker will pick you up going all the way to Thessaloniki and on to Italy, otherwise the first 20 km are tricky (lot or cars going short distances) but after you pass Pernik you'll get a ride all the way south to Blagoevgrad in no time.