Don't worry, you don't have any problems with the path and guidelines along the way. I guess you know how to get out of your city and the rest is a clean regional road/highway, you avoid populated areas (most of them) until Κεραμωτή.
You have three routes that overlap, they are all correct. Even if you go through Sofia (you pass by).
Unforeseen Incidents along the way are possible, nothing can predict that. Always be ready for something like that. A few kilometers more or less is not a problem.
P.S.
Better use TT maps
Drive safely, use your eyes and brain
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