A complete and beautiful trip. We went by ourselves to the train station without much difficulty and found everything fine. The workers at the station help a lot and many times you just have to follow all the tourists to know where to go. The trip is 4 hours and the train is a bit uncomfortable. I recommend taking a travel pillow. They have chargers too and a bar. Once in Kalambaka we were met by Krissa, the guide. He was very nice and informed us of everything very precisely. You can tell he was competent at it. We visited Gran Meteora, Vaarland and San Esteban. We liked it a lot even though they made us wear a ridiculous skirt when we were covered to the top because of the cold it is, but hey. Incredible views and a good atmosphere. The stairs are not difficult in winter (in summer I imagine they are). In general, everything was fine, we didn't have any problems with anything and we left very happy. The return train quite tiring but not bad.