>If you can hike for 15-20km through a Mittelgebirge (so not exclusively flat land) and wake up the next day and feel like you can walk again
When I did that in Swiss Alps and Tuscany I always got blisters and had to rest a bit, but I wore cheap Deichmann walking shoes, which were shit, and I am relatively untrained as I don't hike regularly. But I think I should be able to do that with a bit of training and the right shoes.
>Also we don't have to use camp sites and sleep in a proper accommodation then you don't have to buy camping gear.
I guess, that would be best for the beginning. As you already insinuated, sleep is key and to do proper hiking, one needs to rest well. I should probably focus on the hiking part and if I "succeed", I might be ready to do outdoor camping next time.
>Or I can give you some recommendations on what to buy
I'd definitely need to buy a larger backpack and some hiking clothes. I have similar shoes to pic related, do you think they're enough?