Kate Clow was the driving force behind the opening of the Lycian Way and she helped to write the guidebook that covers it from Hisaronu to Antalya. It's well marked for most of it's length, but you only need to make a simple mistake and it's very easy to become lost and disorientated, especially in low-light.
I've walked it as far as Kas and acted as guide and back-up to several groups in the past.