Arrival from Vienna: A2 to Neunkirchen, S6 direction Langenwang, exit Schwöbing over the Alpl. Through St. Kathrein and then on to Fischbach.
Arrival from Graz: A2 to exit Gleisdorf, B64 direction Weiz. Traffic circle before Weiz on the B72 direction Anger, Birkfeld, Fischbach.
Arrival from Salzburg: 145 via Liezen, then continue to Leoben, from Leoben direction Kindberg (S6), Stanz via Mürztal, Fischbach.
Detailed information on how to get there can be found here.