789 from France

My work ends the 31st of July in France and i would like to know if some of you tell a way to Odessa from Paris or Toulouse. I heard that hichhikking through North Italy could be very hard so i plan to go through by Swiss. Is it possible to be in Odessa in 7 days (i can't leave before the 1st) ? Do you know some places to sleep on the way ?