First of all, if you have a good A1C prior to the birth, there likely will be no problem with low blood-sugar. My baby's BG never dipped low enough to require glucose. My A1C, tested a month before birth, was 6.2.
However, my baby girl apparently had an infection and was kept in the NICU 7 days for antibiotics. During that time, I was allowed to stay in a room in the hospital for nursing moms, so I basically lived there and breast-fed her, but unfortunately, could not be there for every feeding, so they did give her bottles also. This made breast-feeding very difficult and frustrating for both her and I. It took about an hour (instead of half an hour like it should have been) for each feeding.
(Also, for some reason, they thought she should be supplemented with bottles even when I was there, before my milk came in. They wanted her to drink 2 oz. at each feeding, which for a day-old baby is just way too much. Babies naturally are not too hungry for the first 2-4 days, and mommas naturally make just the right amount of colostrum for them. Then the milk comes in right around the time that babies are needing more food. So if the baby's BG is fine, don't let the hospital trick you into supplementing because "the baby's not getting enough"!)
She latched on just fine, no problem, before the bottles, then like night and day, had trouble after her first bottle. But with a little determination and refusal to give up, I kept feeding her as often as I could, frustrating as it was, and it got better, especially once we finally left the hospital (Hallelujah!). Now breast-feeding is all she wants and it's hard to get her to take a bottle!
So, my encouragement to you is: don't give the baby bottles if you can help it, but if he/she is given bottles, stick with breastfeeding anyway, and if you have to, read books, talk to consultants, read web articles (many good ones at lalecheleague.com I believe it is). You can do it!