| What Gary said.
If your basals are off at all, you'll never get your meal ratios set properly. Once you get your basal rates and meal profiles set, it really is clear sailing.
Every test should mean something to you. For years I never bothered testing much because they didn't tell me anything. Now every one does because I understand my behavior so much better. When I have an off test I can pinpoint the probable cause(s) very quickly and act properly. No or little guessing.
"Think Like a Pancreas" and "Pumping Insulin" should be in your library. | 
