Even though I'm sure this question has been asked here before, I can't seem to find the answer anywhere. I have a 5 country/8 day selectpass and I worried about the reservations I need to make because I'm already reserving hostels. Most of the trains I plan on taking are night trains and I've heard they tend to fill up faster than others, especially if you want a couchette.
1) How do I make reservations from the States before my trip? Can I do it as soon as I arrive in Europe? Is that better?
2) Unrelated, but what exactly IS 'validating'? My booklet tells me how to do it, but doesn't exactly tell me what it does.