We did a round trip starting at Lenart pri Gornjem Gradu, through Lepenatka and then Climbing path to the top of Veliki Rogatec. The hike is quite easy and suitable for fit beginners, the last climbing part to Veliki Rogatec is very demanding though secured by wires and iron steps, there is also an easier alternative route up. You can read more and check my GPS track here: https://www.czickontheroad.com/easy-hike-slovenia-savinja