Hello Chris, and welcome 🙂
There is a lot to learn at first, but you will be surprised how quickly you pick it all up - very soon it will become second nature and you will be able to get on with your life and think of testing and injecting and so on as a minor nuisance. As Sue says, it's safer to bring your blood sugar down slowly, so don't worry, your readings will get to normal levels eventually now you're on insulin. Also, the doses they put you on at first are a "best guess" so it's normal to have to tweak them a bit over time.
If there's anything in particular you're struggling with, or you have any questions, please do ask - as Flower says, someone here is sure to be able to help. And please don't be afraid to ring your hospital Diabetes Specialist Nurse (assuming you have one - if you don't, ask your GP to be referred to one!) any time you need help with things like adjusting the insulin - DSNs are the real experts in type 1.