Albania, Valbona to Theth hike

Going on a 6 week trip through Europe in just over two weeks and one of the last things on my trip is the Valbona to Theth hike.

I would not describe myself as fit and propbably describe myself as low-medium fitness level. I am getting a little anxious about the hike at the moment due to my fitness level.

This is something I would love to do, everything I have seen of it seems amazing but I am worried about my ability to do it. Can anyone who has done this hike give me advice on the difficulty of the hike and really how fit do you need to be?