I understand the first 7 basic course flights are in the CT-4B and the final 3 in the CAP-10.
Yes.
What are the main differences between flying these aircraft (other than ground handling with the CAP-10's tail-wheel) and is the transition between them difficult?
CAP10 is much more responsive than the CT4. Don't under-estimate it on the ground. Keep your taxi speed under control! Your ability to transition from CT4 to CAP10 will certainly be regarded with interest. Some handle it better than others.
Do the instructor's assume nil flight experience on the basic course?
Yes.
How quickly does the course progress (i.e. do you get to stalls, steep turns, spins, inverted flight, etc.?)?
Stalls and steep turns on the CT4 phase. Spins on the CAP10. No inverted flight for the basic phase.
I will back up what slow n low said. Relax, do what they tell you to do, and prepare.
You can get on the gas every night as well if you want... its your choice
I know he was kidding, but to make it clear - I would strongly reccommed you don't get on the wallop. If you can't stay off the turps for a couple of weeks, your motivation is in question!