Do no training and little planning, carry bare minimum with definitely no support.
Relax, and enjoy the 'journey'.
That is honestly what me and 2 pals did last summer. Did it in two weeks unsupported staying in the cheapest youth hostels we could find, Camped in Scotland and lived on 1/2 kilo pasta each every night. My only tip would be pack light, if you have to 'think' about bringing something, chances are you probably won't need it.