Hi Marki -
<<"We have no hiking experience.">>
We don't really know what that means. We don't know how fit Maksim and friend are.
<<"I would think how fit and generally active you are would matter more than experience.">>
<<"If Maksim was planning on hiking from Lauderbrunnen to Grindelwald to Bachalpsee, I assumed he was in reasonably good shape.">>
I would assume the opposite until I learned otherwise, and for advice on this forum, you can be providing it to people with a wide range of fitness.
As a result, the advice should differ if there are no " escapes" or "shortcuts" or "cheating" ( as Maksim calls it) available, compared to advice hikes where they are..
They can always provide commentary on their fitness in a conversation.
I figure that giving them a topo map is a good first step.
Although I am older than you, when I was considerably younger than you, I would find that exertion at elevations above " a mile high" to use our familiar American phrase , and certainly 600 to 700 meter altitude changes above 2000 meters would leave me short of breath and slow me down substantially on climbs. It got easier if I became acclimated to high altitude, low oxygen partial pressure exercise over a few days. 600 to 700 meter altitude changes above 2000 meters
You are in good shape if you make that trip in a time close to the posted times. I have friends who have done so, and others who have stayed at Faulhorn because their legs were not good for the downhill in the same day, after they had done the uphill.
Arno's advice and the link in My Swiss Alps were right on the spot as a way to judge capability.....and your advice as well about the last ride down at either end.
You comment about maps and trails is close to my experience....so, before I use one of the kinds of maps that you describe, especially in mountainous regionms, my practice before online maps, was to buy the 1;50,000 paper hiking maps, die Wanderkarten, and carefully look over the altitude profiles. Sometimes, 1:25,000 in tricky terrain. Now, you can do it online. However, I find paper maps better for planning a hike in unknown territory, because you can see a lot more of the alternatives and general lay of the land, while still having the detail at your fingertips.
shop.swisstopo.admin.c h/en/products/maps/lei sure/hike/hiking_maps5 0
Swiss topo offers their map in a smartphone app, for detail on the trail these days.
shop.swisstopo.admin.c h/en/products/maps/Swi ssMapMobile_Abo
Since I have collected those maps over many years, I have a lot of them, and arry them on the trail. Sometiomes the routes of the marked trails ( die Wanderwege) are chnaged, and usuallyu you can figure that out from the signage and a good map, in the lwlands. In thee high alps on steep slpoes. ytails suchas Schynige Plateto/from First are so clearly marked that you are safe without a map in those circumstances, but if you are on a lesser trail that is more demanding, it is important to be up to date.
The descent to Alpiglen on the Eiger Trail is 400 meters of switchbacks. My knees and legs in general always need a break for a Käseschnitte at the inn at Alpiglen.