Sorry to hear of your recent diagnosis. It is such an overwhelming time getting used to the testing, injections, diet and exercise planning.
I can't help with techniques for testing as Khaleb was so young diagnosed that he doesn't know any other life. He's not about to freely let me give him an injection but I do find the best way for us is to have him draped over my lap. I can reach his butt, hip fat, front of his thigh, and tummy all from this position without having to unduly restrain him. I can put something good to play with in front of his face and hands to keep him busy and can keep the area I need still. I find I can scratch Khaleb with the needle or have the pen needle come out during the injection if he isn't held still. I've also managed to stick the needle in my hand etc...
How are you doing the injections now?
Anyway, the parents here are always happy to offer their experience. I hope you have some help organising school as some training will be needed and you'll need to provide information about your routine and hypo treatment options etc...
All the best, Jen