Use overnight trains to get a) Free Sleep, b) maximum time in a place, c) Minimum wasted travelling time.
Spend time in Eastern Europe where your money goes further.
Hook up with every contact you ever made through Forums like this to maximise Free accommodation.
Don't stick too rigidly to a plan. Once in Berlin I realised the following day was 14th July, Bastille day in France. Hopped on an overnight and was in France for the big party the following morning. More flexibility means you can take ideas from the people you meet en route too.
Have fun.
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