Walking in the Viennese Alps should be a completely safe and beautiful experience. Therefore, please note the following:
Make sure that your choice of route matches your hiking experience and your physical condition. Check the weather forecast. In the mountains, the weather can change surprisingly quickly. For this reason, make sure you are well-equipped (e.g. bring rain protection).
Check that the huts and refreshment stations that you want to visit along the way will be open. Tell someone which route you have chosen, and when you hope to return, before you set off.