So true. I travelled for 18 months in the 1990s, and before I left home I used to wake up at 4am worrying about the types of toilets I might have to use and the type of bed I might have to sleep on. But after camping wild in the Iranian countryside and the toilet being behind a bush I felt I could do anything!
These days I do lots of small expeditions to local mountains, and much of what you say applies to those smaller trips too.