Type 1 don't produce any insulin at all - hence the need to go straight on insulin; whereas type 2 still produce some insulin so do not always need to inject, as the oral medications can stimulate the body to produce the insulin needed to cope with the blood glucose.
DAFNE is a bit more complex than just count the carbs and then inject - there are lots of other factors to take into account before dosing which will be taught in depth on the course, sounds like he is already making progress though Yvessa, which will make it so much easier for him once he's done the course.
xx