Hiking route/maps

Hi,
I am planning a "hut to hut" trip in the Bernese Oberland for July. The itinerary is Grindewald to Wengen, Wengen to Oberstienberg, Oberstienberg to Murren and Murren to Kandersteg. I have found hiking descriptions for most of the hikes to each location, the one that I am having trouble finding is from Obersteinberg to Murren. It sounds like there are two different options, a high route and a low route. I have been unable to find either of these hikes described anywhere i.e. distance, grading, signage etc. Do you know if I can find this somewhere for each route?

Secondly, is it imperative that I purchase a topo map for this trip and if so, can I get it in Switzerland?

Thank you for any advice.