Yes ... what kind of activity level do you have now?
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My early days of touring were hub-and-spoke or short (less than a week) tours. My first somewhat longer tour was in 2003.
By then, I had been riding avidly for 13 years, I had spent 3 years racing, and then got into Randonneuring. My motivation for that somewhat longer tour in 2003 was to ride the Paris-Brest-Paris 1200K ... and while I was in that part of the world, I also toured. So I had been training for the 1200K event.
If you want to do 80-160 km/day, my recommendation would be 1) get at least one century (160 km) ride in, preferably more; 2) ride enough that you feel really comfortable with 80 km.
And on your 9 week tour, make sure you've got some rest days planned.