I just wanted to agree with checking your blood sugar frequently especially at first. I was very sensitive to insulin when I first started using it and would get lows ALOT. ANY time you feel "not right" I would check your blood sugar. You will start to notice patterns with how your body feels and what your sugars are. Many times I am able to say what my blood sugar is NOW before I even test it because I gte the same symptoms with highs and lows every time I have them.
Also something about giving the injections. If you are small - skinny - you may need to give your injections at a slight angle. When I first started taking shots I was told to go in at a 90 degree angle, but that was wrong. I later read that smaller patients may have to use a 45 degree angle or something to that effect. When I was using the 90 degree angle I bruised horribly - once I went to 45 degrees I stopped bruising.
ALSO make sure to rotate your injection sites. I used to rotate between my stomach and legs. I tended to favor my stomach cause there was more "fat" there than my legs but really try to rotate as best as possible.
Other than that just carry a snack with you everywhere and also something that my doc told me to do a lot at first was to check my blood sugar before driving to make sure it wasn't low. I tend to drop low VERY fast and with few if any symptoms - I would get hungry but that was it until my sugar would get to about 40 and then I would start to sweat and shake and such. Anywho.
Good luck with the injections - you will develop your own tricks and adapt your insulin use to you over time. It just takes some time. For me it took a month to work out the kinks with my lows and a few more months to really figure out what I could and could not eat and how things affected my sugars. Also how my sugars made me feel at certain levels. If you have lost any weight recently - you may gain some back as your sugars stabilize too. Just so you know.
Take Care,
Linds