I'm doing this now, and the thing I find most surprising is that there seems to be some invisible persistent state that gives high or low sugar a sort of momentum - so if I've been doing a fair amount of physical activity for a month, I can lay slugabed for two days and still drive to have a slice of pizza in the afternoon without trouble; but if I've been slacking on the activity piece, or arguing with my spouse, or travelling and eating a lot of dubious things, I can walk five kms to a pizza place, eat the slice, walk the 5 kms back, and it will still spike. Also I have issues with the CGM being higher than the prick-blood test, like 40 points higher rather consistently. A1C is still dropping, but the CGM numbers are more directionally accurate than numerically accurate.