Imagination and Knowledge

I am planning to go on a walking holiday in Europe in late 2026! I am very excited.

I know a few of y'all have done these, and I would love to get your advice and recommendations. The things I am primarily thinking of include, in no particular order:

• organizing flights to and from the start point; I don't think the walking holiday company does this since I'm in the US -- I may have some complications and don't love the idea of sorting it out entirely on my own
• what to wear on the daily hike & what supplies to carry with me

but I would be very grateful for suggestions of things to consider that I have not thought of! I have wanted to do this for a long time but I have not ever done it.