LittleFrieda? I will gladly tell you about it! That said I am outing myself as how many self employed mothers of three with a DH who teaches took their kids around Europe for 2mths 
Save, save and save some more? it is expensive!
We still had DH?s wage coming in when away to cover all the essential bills that leave the account every month (mortgage, insurances etc) so we opened a separate joint account, transferred our travel budget into it, and only used it when away. We also took the ?emergency? credit card JUST INCASE!
We lived in a popular costal area so we let our home to holiday makers over the summer and paid a friend to handle change over, cleaning etc. This made us a whopping £4000 profit after paying friend £800
. This was put back into the savings we plundered to go!
PLAN PLAN AND PLAN SOME MORE!!!
We saved a fortune by purchasing 2 lots of InterRail passes that let us travel 10 times in 22 days (so 20 days of travel in 44 days altogether). We were away for 56 days all in and flew out and back so this was more than enough. The rain passes cost us just over £1800 three years ago including pass loss/theft insurance. By doing this we saved over £1000 compared to the travel any day option. We also hired a car to see more of certain countries.
We flew into Krakow to begin with, We stayed in the Novotel 92 x double beds) and got it quite cheaply? £40 a night if I remember rightly through a hotel comparison site!
The salt mines were a great trip with the children but mostly, like everywhere we went, we wandered around, ate local food and soaked up the atmosphere.
We then went to? Austria via Chez Republic, into Germany (Munich only), Switzerland, Italy, South of France, Spain (Barcelona only), back into France, Belgum, Netherlands then Germany? we flew home from Berlin.
We used a selection of accommodation? family rooms in hotels, Apartment in Barcelona, holiday let in France (+ a few nights in Disney Paris).
We tried to book an apartment or cottage once a fortnight to make sure we had easy access to a washing machine! We had the shoes we wore plus sandals, DH and I had larger backpacks and the DC?s had little ones to hold their own toy, ds and a snack.