Don't simply rely on "how you feel" to determine what your BG levels are. If you guess wrong, and base your bolus amounts or basal adjustment on this wrong guess, you could end up with seriously high or low Blood Glucose levels.
Besides your pump, you will quickly develop a strong working relationship with your Blood Glucose monitor ;-) You might find yourself swearing at it when the readings are high, but you will smile at it when the readings are "right on". Your meter will not respond to screaming or swearing (I know, because I still try this). The only thing which will change the numbers on the meter are changes in your blood glucose levels.