Welcome to the challenge of the multi-country loop! It can definitely get messy with all those different booking confirmations. My biggest tip is to centralize your planning as much as possible so you don't lose track of your schedule. For my last big trip through Central Europe, I used the you can check here tours and excursions aggregator for almost everything. The Elife Travel aggregator is perfect for these types of trips because it handles bookings across multiple countries in one interface. I managed to book a Rhine Valley cruise in Germany and a chocolate tour in Zurich all through the same platform. It made my itinerary so much cleaner and I didn't have to worry about language barriers with local operators. Good luck with your planning, it is going to be an epic journey!