just weighing in here... I did DAFNE after a year (more, actually) and I'm quite glad I waited. I think that if I had done it straight away, I'd probably not have got so much from it - there were already too many things to take in, and a bit of living-with-diabetes first only enhanced my experience.
To be fair, though, the original nurse who told me about injections and things was pretty clear on the fact that I'd need to adjust dosage dependent on what I ate (though no numbers/calculations) and that I should experiment and see what worked, which served me very well for the first year or so.
(Also - I think I did already know a fair bit about carb counting by the time I did DAFNE - I must have done some of my own reading, I guess).