Most of the money on a trip goes on three things: getting there, sleeping and eating out. Small changes to each add up quickly.
Getting there
Book flights on a weekday, fly into smaller airports and use night trains when they replace a night of accommodation.
Where to stay
Stay a week in one place instead of moving every two days. Weekly rates are often a third cheaper, and you save on transport too.
What I would do differently
I would track expenses from day one. You cannot cut what you do not see.
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Prices in this guide are what I paid. They move every season, so use them as a rough guide.