Good luck with the change, I'm sure that you and Dylan will be fine but be prepared for the odd high or low numbers. They will happen untill you get your basals and boluses just right, at least thats what we found. Once you are sorted with background insulin it gets so much easier. You may find as we did that the IC ratios change a bit and that he will need slightly less insulin to cover his meals but then he can snack mid morning or afternoon.
All the best
Harry