Shoot both subq

with growth it takes approx 5 weeks for igf levels to become constantly raised so would suggest waiting until then to use the insulin. With the gh you can shoot IM or SUBQ with the insulin i would only shoot subq as IM will hit you a lot faster and you dont want that until you are well experienced with how you react pre work out.

Whats your carb protocol when you inject insulin? I think novorapid may be slightly longer acting than novolog and humalog too.